describe('Array', function() {
var testSubject;
beforeEach(function() {
testSubject = [2, 3, undefined, true, 'hej', null, false, 0];
delete testSubject[1];
});
function createArrayLikeFromArray(arr) {
var o = {};
Array.prototype.forEach.call(arr, function(e, i) {
o[i]=e;
});
o.length = arr.length;
return o;
};
describe('forEach', function() {
"use strict";
var expected, actual;
beforeEach(function() {
expected = {0:2, 2: undefined, 3:true, 4: 'hej', 5:null, 6:false, 7:0 };
actual = {};
});
it('should pass the right parameters', function() {
var callback = jasmine.createSpy('callback'),
array = ['1'];
array.forEach(callback);
expect(callback).toHaveBeenCalledWith('1', 0, array);
});
it('should not affect elements added to the array after it has begun', function() {
var arr = [1,2,3],
i = 0;
arr.forEach(function(a) {
i++;
arr.push(a+3);
});
expect(arr).toEqual([1,2,3,4,5,6]);
expect(i).toBe(3);
});
it('should set the right context when given none', function() {
var context;
[1].forEach(function() {context = this;});
expect(context).toBe(function() {return this}.call());
});
it('should iterate all', function() {
testSubject.forEach(function(obj, index) {
actual[index] = obj;
});
expect(actual).toExactlyMatch(expected);
});
it('should iterate all using a context', function() {
var o = { a: actual };
testSubject.forEach(function(obj, index) {
this.a[index] = obj;
}, o);
expect(actual).toExactlyMatch(expected);
});
it('should iterate all in an array-like object', function() {
var ts = createArrayLikeFromArray(testSubject);
Array.prototype.forEach.call(ts, function(obj, index) {
actual[index] = obj;
});
expect(actual).toExactlyMatch(expected);
});
it('should iterate all in an array-like object using a context', function() {
var ts = createArrayLikeFromArray(testSubject),
o = { a: actual };
Array.prototype.forEach.call(ts, function(obj, index) {
this.a[index] = obj;
}, o);
expect(actual).toExactlyMatch(expected);
});
});
describe('some', function() {
var actual, expected, numberOfRuns;
beforeEach(function() {
expected = {0:2, 2: undefined, 3:true };
actual = {};
numberOfRuns = 0;
});
it('should pass the correct values along to the callback', function() {
var callback = jasmine.createSpy('callback');
var array = ['1'];
array.some(callback);
expect(callback).toHaveBeenCalledWith('1', 0, array);
});
it('should not affect elements added to the array after it has begun', function() {
var arr = [1,2,3],
i = 0;
arr.some(function(a) {
i++;
arr.push(a+3);
return i > 3;
});
expect(arr).toEqual([1,2,3,4,5,6]);
expect(i).toBe(3);
});
it('should set the right context when given none', function() {
var context;
[1].some(function() {context = this;});
expect(context).toBe(function() {return this}.call());
});
it('should return false if it runs to the end', function() {
actual = testSubject.some(function() {});
expect(actual).toBeFalsy();
});
it('should return true if it is stopped somewhere', function() {
actual = testSubject.some(function() { return true; });
expect(actual).toBeTruthy();
});
it('should return false if there are no elements', function() {
actual = [].some(function() { return true; });
expect(actual).toBeFalsy();
});
it('should stop after 3 elements', function() {
testSubject.some(function(obj, index) {
actual[index] = obj;
numberOfRuns += 1;
if(numberOfRuns == 3) {
return true;
}
return false;
});
expect(actual).toExactlyMatch(expected);
});
it('should stop after 3 elements using a context', function() {
var o = { a: actual };
testSubject.some(function(obj, index) {
this.a[index] = obj;
numberOfRuns += 1;
if(numberOfRuns == 3) {
return true;
}
return false;
}, o);
expect(actual).toExactlyMatch(expected);
});
it('should stop after 3 elements in an array-like object', function() {
var ts = createArrayLikeFromArray(testSubject);
Array.prototype.some.call(ts, function(obj, index) {
actual[index] = obj;
numberOfRuns += 1;
if(numberOfRuns == 3) {
return true;
}
return false;
});
expect(actual).toExactlyMatch(expected);
});
it('should stop after 3 elements in an array-like object using a context', function() {
var ts = createArrayLikeFromArray(testSubject);
var o = { a: actual };
Array.prototype.some.call(ts, function(obj, index) {
this.a[index] = obj;
numberOfRuns += 1;
if(numberOfRuns == 3) {
return true;
}
return false;
}, o);
expect(actual).toExactlyMatch(expected);
});
});
describe('every', function() {
var actual, expected, numberOfRuns;
beforeEach(function() {
expected = {0:2, 2: undefined, 3:true };
actual = {};
numberOfRuns = 0;
});
it('should pass the correct values along to the callback', function() {
var callback = jasmine.createSpy('callback');
var array = ['1'];
array.every(callback);
expect(callback).toHaveBeenCalledWith('1', 0, array);
});
it('should not affect elements added to the array after it has begun', function() {
var arr = [1,2,3],
i = 0;
arr.every(function(a) {
i++;
arr.push(a+3);
return i <= 3;
});
expect(arr).toEqual([1,2,3,4,5,6]);
expect(i).toBe(3);
});
it('should set the right context when given none', function() {
var context;
[1].every(function() {context = this;});
expect(context).toBe(function() {return this}.call());
});
it('should return true if the array is empty', function() {
actual = [].every(function() { return true; });
expect(actual).toBeTruthy();
actual = [].every(function() { return false; });
expect(actual).toBeTruthy();
});
it('should return true if it runs to the end', function() {
actual = [1,2,3].every(function() { return true; });
expect(actual).toBeTruthy();
});
it('should return false if it is stopped before the end', function() {
actual = [1,2,3].every(function() { return false; });
expect(actual).toBeFalsy();
});
it('should return after 3 elements', function() {
testSubject.every(function(obj, index) {
actual[index] = obj;
numberOfRuns += 1;
if(numberOfRuns == 3) {
return false;
}
return true;
});
expect(actual).toExactlyMatch(expected);
});
it('should stop after 3 elements using a context', function() {
var o = { a: actual };
testSubject.every(function(obj, index) {
this.a[index] = obj;
numberOfRuns += 1;
if(numberOfRuns == 3) {
return false;
}
return true;
}, o);
expect(actual).toExactlyMatch(expected);
});
it('should stop after 3 elements in an array-like object', function() {
var ts = createArrayLikeFromArray(testSubject);
Array.prototype.every.call(ts, function(obj, index) {
actual[index] = obj;
numberOfRuns += 1;
if(numberOfRuns == 3) {
return false;
}
return true;
});
expect(actual).toExactlyMatch(expected);
});
it('should stop after 3 elements in an array-like object using a context', function() {
var ts = createArrayLikeFromArray(testSubject);
var o = { a: actual };
Array.prototype.every.call(ts, function(obj, index) {
this.a[index] = obj;
numberOfRuns += 1;
if(numberOfRuns == 3) {
return false;
}
return true;
}, o);
expect(actual).toExactlyMatch(expected);
});
});
describe('indexOf', function() {
"use strict";
var actual, expected, testSubject;
beforeEach(function() {
testSubject = [2, 3, undefined, true, 'hej', null, 2, false, 0];
delete testSubject[1];
});
it('should find the element', function() {
expected = 4;
actual = testSubject.indexOf('hej');
expect(actual).toEqual(expected);
});
it('should not find the element', function() {
expected = -1;
actual = testSubject.indexOf('mus');
expect(actual).toEqual(expected);
});
it('should find undefined as well', function() {
expected = -1;
actual = testSubject.indexOf(undefined);
expect(actual).not.toEqual(expected);
});
it('should skip unset indexes', function() {
expected = 2;
actual = testSubject.indexOf(undefined);
expect(actual).toEqual(expected);
});
it('should use a strict test', function() {
actual = testSubject.indexOf(null);
expect(actual).toEqual(5);
actual = testSubject.indexOf('2');
expect(actual).toEqual(-1);
});
it('should skip the first if fromIndex is set', function() {
expect(testSubject.indexOf(2, 2)).toEqual(6);
expect(testSubject.indexOf(2, 0)).toEqual(0);
expect(testSubject.indexOf(2, 6)).toEqual(6);
});
it('should work with negative fromIndex', function() {
expect(testSubject.indexOf(2, -3)).toEqual(6);
expect(testSubject.indexOf(2, -9)).toEqual(0);
});
it('should work with fromIndex being greater than the length', function() {
expect(testSubject.indexOf('hej', 20)).toEqual(-1);
});
it('should work with fromIndex being negative and greater than the length', function() {
expect(testSubject.indexOf('hej', -20)).toEqual(4);
});
describe('Array-like', function ArrayLike() {
var indexOf = Array.prototype.indexOf,
testAL;
beforeEach(function beforeEach() {
testAL = {};
testSubject = [2, 3, undefined, true, 'hej', null, 2, false, 0];
testSubject.forEach(function (o,i) {
testAL[i] = o;
});
testAL.length = testSubject.length;
});
it('should find the element (array-like)', function() {
expected = 4;
actual = indexOf.call(testAL, 'hej');
expect(actual).toEqual(expected);
});
it('should not find the element (array-like)', function() {
expected = -1;
actual = indexOf.call(testAL, 'mus');
expect(actual).toEqual(expected);
});
it('should find undefined as well (array-like)', function() {
expected = -1;
actual = indexOf.call(testAL, undefined);
expect(actual).not.toEqual(expected);
});
it('should skip unset indexes (array-like)', function() {
expected = 2;
actual = indexOf.call(testAL, undefined);
expect(actual).toEqual(expected);
});
it('should use a strict test (array-like)', function() {
actual = Array.prototype.indexOf.call(testAL, null);
expect(actual).toEqual(5);
actual = Array.prototype.indexOf.call(testAL, '2');
expect(actual).toEqual(-1);
});
it('should skip the first if fromIndex is set (array-like)', function() {
expect(indexOf.call(testAL, 2, 2)).toEqual(6);
expect(indexOf.call(testAL, 2, 0)).toEqual(0);
expect(indexOf.call(testAL, 2, 6)).toEqual(6);
});
it('should work with negative fromIndex (array-like)', function() {
expect(indexOf.call(testAL, 2, -3)).toEqual(6);
expect(indexOf.call(testAL, 2, -9)).toEqual(0);
});
it('should work with fromIndex being greater than the length (array-like)', function() {
expect(indexOf.call(testAL, 'hej', 20)).toEqual(-1);
});
it('should work with fromIndex being negative and greater than the length (array-like)', function() {
expect(indexOf.call(testAL, 'hej', -20)).toEqual(4);
});
});
});
describe('lastIndexOf', function() {
"use strict";
var actual, expected, testSubject, testAL;
beforeEach(function() {
testSubject = [2, 3, undefined, true, 'hej', null, 2, 3, false, 0];
delete testSubject[1];
delete testSubject[7];
});
describe('Array', function() {
it('should find the element', function() {
expected = 4;
actual = testSubject.lastIndexOf('hej');
expect(actual).toEqual(expected);
});
it('should not find the element', function() {
expected = -1;
actual = testSubject.lastIndexOf('mus');
expect(actual).toEqual(expected);
});
it('should find undefined as well', function() {
expected = -1;
actual = testSubject.lastIndexOf(undefined);
expect(actual).not.toEqual(expected);
});
it('should skip unset indexes', function() {
expected = 2;
actual = testSubject.lastIndexOf(undefined);
expect(actual).toEqual(expected);
});
it('should use a strict test', function() {
actual = testSubject.lastIndexOf(null);
expect(actual).toEqual(5);
actual = testSubject.lastIndexOf('2');
expect(actual).toEqual(-1);
});
it('should skip the first if fromIndex is set', function() {
expect(testSubject.lastIndexOf(2, 2)).toEqual(0);
expect(testSubject.lastIndexOf(2, 0)).toEqual(0);
expect(testSubject.lastIndexOf(2, 6)).toEqual(6);
});
it('should work with negative fromIndex', function() {
expect(testSubject.lastIndexOf(2, -3)).toEqual(6);
expect(testSubject.lastIndexOf(2, -9)).toEqual(0);
});
it('should work with fromIndex being greater than the length', function() {
expect(testSubject.lastIndexOf(2, 20)).toEqual(6);
});
it('should work with fromIndex being negative and greater than the length', function() {
expect(testSubject.lastIndexOf(2, -20)).toEqual(-1);
});
});
describe('Array like', function() {
var lastIndexOf = Array.prototype.lastIndexOf,
testAL;
beforeEach(function() {
testAL = {};
testSubject.forEach(function (o,i) {
testAL[i] = o;
});
testAL.length = testSubject.length;
});
it('should find the element (array-like)', function() {
expected = 4;
actual = lastIndexOf.call(testAL, 'hej');
expect(actual).toEqual(expected);
});
it('should not find the element (array-like)', function() {
expected = -1;
actual = lastIndexOf.call(testAL, 'mus');
expect(actual).toEqual(expected);
});
it('should find undefined as well (array-like)', function() {
expected = -1;
actual = lastIndexOf.call(testAL, undefined);
expect(actual).not.toEqual(expected);
});
it('should skip unset indexes (array-like)', function() {
expected = 2;
actual = lastIndexOf.call(testAL, undefined);
expect(actual).toEqual(expected);
});
it('should use a strict test (array-like)', function() {
actual = lastIndexOf.call(testAL, null);
expect(actual).toEqual(5);
actual = lastIndexOf.call(testAL, '2');
expect(actual).toEqual(-1);
});
it('should skip the first if fromIndex is set', function() {
expect(lastIndexOf.call(testAL, 2, 2)).toEqual(0);
expect(lastIndexOf.call(testAL, 2, 0)).toEqual(0);
expect(lastIndexOf.call(testAL, 2, 6)).toEqual(6);
});
it('should work with negative fromIndex', function() {
expect(lastIndexOf.call(testAL, 2, -3)).toEqual(6);
expect(lastIndexOf.call(testAL, 2, -9)).toEqual(0);
});
it('should work with fromIndex being greater than the length', function() {
expect(lastIndexOf.call(testAL, 2, 20)).toEqual(6);
});
it('should work with fromIndex being negative and greater than the length', function() {
expect(lastIndexOf.call(testAL, 2, -20)).toEqual(-1);
});
});
});
describe('filter', function() {
var filteredArray,
callback = function callback(o, i, arr) {
return (
i != 3 && i != 5
);
};
beforeEach(function() {
testSubject = [2, 3, undefined, true, 'hej', 3, null, false, 0];
delete testSubject[1];
filteredArray = [2, undefined, 'hej', null, false, 0];
});
describe('Array object', function() {
it('should call the callback with the proper arguments', function() {
var callback = jasmine.createSpy('callback'),
arr = ['1'];
arr.filter(callback);
expect(callback).toHaveBeenCalledWith('1', 0, arr);
});
it('should not affect elements added to the array after it has begun', function() {
var arr = [1,2,3],
i = 0;
arr.filter(function(a) {
i++;
if(i <= 4) {
arr.push(a+3);
}
return true;
});
expect(arr).toEqual([1,2,3,4,5,6]);
expect(i).toBe(3);
});
it('should skip non-set values', function() {
var passedValues = {};
testSubject = [1,2,3,4];
delete testSubject[1];
testSubject.filter(function(o, i) {
passedValues[i] = o;
return true;
});
expect(passedValues).toExactlyMatch(testSubject);
});
it('should pass the right context to the filter', function() {
var passedValues = {};
testSubject = [1,2,3,4];
delete testSubject[1];
testSubject.filter(function(o, i) {
this[i] = o;
return true;
}, passedValues);
expect(passedValues).toExactlyMatch(testSubject);
});
it('should set the right context when given none', function() {
var context;
[1].filter(function() {context = this;});
expect(context).toBe(function() {return this}.call());
});
it('should remove only the values for which the callback returns false', function() {
var result = testSubject.filter(callback);
expect(result).toExactlyMatch(filteredArray);
});
it('should leave the original array untouched', function() {
var copy = testSubject.slice();
testSubject.filter(callback);
expect(testSubject).toExactlyMatch(copy);
});
it('should not be affected by same-index mutation', function () {
var results = [1, 2, 3]
.filter(function (value, index, array) {
array[index] = 'a';
return true;
});
expect(results).toEqual([1, 2, 3]);
});
});
describe('Array like', function() {
beforeEach(function() {
testSubject = createArrayLikeFromArray(testSubject);
});
it('should call the callback with the proper arguments', function() {
var callback = jasmine.createSpy('callback'),
arr = createArrayLikeFromArray(['1']);
Array.prototype.filter.call(arr, callback);
expect(callback).toHaveBeenCalledWith('1', 0, arr);
});
it('should not affect elements added to the array after it has begun', function() {
var arr = createArrayLikeFromArray([1,2,3]),
i = 0;
Array.prototype.filter.call(arr, function(a) {
i++;
if(i <= 4) {
arr[i+2] = a+3;
}
return true;
});
delete arr.length;
expect(arr).toExactlyMatch([1,2,3,4,5,6]);
expect(i).toBe(3);
});
it('should skip non-set values', function() {
var passedValues = {};
testSubject = createArrayLikeFromArray([1,2,3,4]);
delete testSubject[1];
Array.prototype.filter.call(testSubject, function(o, i) {
passedValues[i] = o;
return true;
});
delete testSubject.length;
expect(passedValues).toExactlyMatch(testSubject);
});
it('should set the right context when given none', function() {
var context;
Array.prototype.filter.call(createArrayLikeFromArray([1]), function() {context = this;}, undefined);
expect(context).toBe(function() {return this}.call());
});
it('should pass the right context to the filter', function() {
var passedValues = {};
testSubject = createArrayLikeFromArray([1,2,3,4]);
delete testSubject[1];
Array.prototype.filter.call(testSubject, function(o, i) {
this[i] = o;
return true;
}, passedValues);
delete testSubject.length;
expect(passedValues).toExactlyMatch(testSubject);
});
it('should remove only the values for which the callback returns false', function() {
var result = Array.prototype.filter.call(testSubject, callback);
expect(result).toExactlyMatch(filteredArray);
});
it('should leave the original array untouched', function() {
var copy = createArrayLikeFromArray(testSubject);
Array.prototype.filter.call(testSubject, callback);
expect(testSubject).toExactlyMatch(copy);
});
});
});
describe('map', function() {
var callback;
beforeEach(function() {
var i = 0;
callback = function() {
return i++;
};
});
describe('Array object', function() {
it('should call callback with the right parameters', function() {
var callback = jasmine.createSpy('callback'),
array = [1];
array.map(callback);
expect(callback).toHaveBeenCalledWith(1, 0, array);
});
it('should set the context correctly', function() {
var context = {};
testSubject.map(function(o,i) {
this[i] = o;
}, context);
expect(context).toExactlyMatch(testSubject);
});
it('should set the right context when given none', function() {
var context;
[1].map(function() {context = this;});
expect(context).toBe(function() {return this}.call());
});
it('should not change the array it is called on', function() {
var copy = testSubject.slice();
testSubject.map(callback);
expect(testSubject).toExactlyMatch(copy);
});
it('should only run for the number of objects in the array when it started', function() {
var arr = [1,2,3],
i = 0;
arr.map(function(o) {
arr.push(o+3);
i++;
return o;
});
expect(arr).toExactlyMatch([1,2,3,4,5,6]);
expect(i).toBe(3);
});
it('should properly translate the values as according to the callback', function() {
var result = testSubject.map(callback),
expected = [0,0,1,2,3,4,5,6];
delete expected[1];
expect(result).toExactlyMatch(expected);
});
it('should skip non-existing values', function() {
var array = [1,2,3,4],
i = 0;
delete array[2];
array.map(function() {
i++;
});
expect(i).toBe(3);
});
});
describe('Array-like', function() {
beforeEach(function() {
testSubject = createArrayLikeFromArray(testSubject);
});
it('should call callback with the right parameters', function() {
var callback = jasmine.createSpy('callback'),
array = createArrayLikeFromArray([1]);
Array.prototype.map.call(array, callback);
expect(callback).toHaveBeenCalledWith(1, 0, array);
});
it('should set the context correctly', function() {
var context = {};
Array.prototype.map.call(testSubject, function(o,i) {
this[i] = o;
}, context);
delete testSubject.length;
expect(context).toExactlyMatch(testSubject);
});
it('should set the right context when given none', function() {
var context;
Array.prototype.map.call(createArrayLikeFromArray([1]), function() {context = this;});
expect(context).toBe(function() {return this}.call());
});
it('should not change the array it is called on', function() {
var copy = createArrayLikeFromArray(testSubject);
Array.prototype.map.call(testSubject, callback);
expect(testSubject).toExactlyMatch(copy);
});
it('should only run for the number of objects in the array when it started', function() {
var arr = createArrayLikeFromArray([1,2,3]),
i = 0;
Array.prototype.map.call(arr, function(o) {
Array.prototype.push.call(arr, o+3);
i++;
return o;
});
delete arr.length;
expect(arr).toExactlyMatch([1,2,3,4,5,6]);
expect(i).toBe(3);
});
it('should properly translate the values as according to the callback', function() {
var result = Array.prototype.map.call(testSubject, callback),
expected = [0,0,1,2,3,4,5,6];
delete expected[1];
expect(result).toExactlyMatch(expected);
});
it('should skip non-existing values', function() {
var array = createArrayLikeFromArray([1,2,3,4]),
i = 0;
delete array[2];
Array.prototype.map.call(array, function() {
i++;
});
expect(i).toBe(3);
});
});
});
describe('reduce', function() {
beforeEach(function() {
testSubject = [1,2,3];
});
describe('Array', function() {
it('should pass the correct arguments to the callback', function() {
var spy = jasmine.createSpy().andReturn(0);
testSubject.reduce(spy);
expect(spy.calls[0].args).toExactlyMatch([1, 2, 1, testSubject]);
});
it('should start with the right initialValue', function() {
var spy = jasmine.createSpy().andReturn(0);
testSubject.reduce(spy, 0);
expect(spy.calls[0].args).toExactlyMatch([0, 1, 0, testSubject]);
});
it('should not affect elements added to the array after it has begun', function() {
var arr = [1,2,3],
i = 0;
arr.reduce(function(a, b) {
i++;
if(i <= 4) {
arr.push(a+3);
};
return b;
});
expect(arr).toEqual([1,2,3,4,5]);
expect(i).toBe(2);
});
it('should work as expected for empty arrays', function() {
var spy = jasmine.createSpy();
expect(function() {
[].reduce(spy);
}).toThrow();
expect(spy).not.toHaveBeenCalled();
});
it('should throw correctly if no callback is given', function() {
expect(function() {
testSubject.reduce();
}).toThrow();
});
it('should return the expected result', function() {
expect(testSubject.reduce(function(a,b) {
return (a||'').toString()+(b||'').toString();
})).toEqual(testSubject.join(''));
});
it('should not directly affect the passed array', function() {
var copy = testSubject.slice();
testSubject.reduce(function(a,b) {
return a+b;
});
expect(testSubject).toEqual(copy);
});
it('should skip non-set values', function() {
delete testSubject[1];
var visited = {};
testSubject.reduce(function(a,b) {
if(a)
visited[a] = true;
if(b)
visited[b] = true;
return 0;
});
expect(visited).toEqual({ '1': true, '3': true });
});
it('should have the right length', function() {
expect(testSubject.reduce.length).toBe(1);
});
});
describe('Array-like objects', function() {
beforeEach(function() {
testSubject = createArrayLikeFromArray(testSubject);
testSubject.reduce = Array.prototype.reduce;
});
it('should pass the correct arguments to the callback', function() {
var spy = jasmine.createSpy().andReturn(0);
testSubject.reduce(spy);
expect(spy.calls[0].args).toExactlyMatch([1, 2, 1, testSubject]);
});
it('should start with the right initialValue', function() {
var spy = jasmine.createSpy().andReturn(0);
testSubject.reduce(spy, 0);
expect(spy.calls[0].args).toExactlyMatch([0, 1, 0, testSubject]);
});
it('should not affect elements added to the array after it has begun', function() {
var arr = createArrayLikeFromArray([1,2,3]),
i = 0;
Array.prototype.reduce.call(arr, function(a, b) {
i++;
if(i <= 4) {
arr[i+2] = a+3;
};
return b;
});
expect(arr).toEqual({
0: 1,
1: 2,
2: 3,
3: 4,
4: 5,
length: 3
});
expect(i).toBe(2);
});
it('should work as expected for empty arrays', function() {
var spy = jasmine.createSpy();
expect(function() {
Array.prototype.reduce.call({length: 0}, spy);
}).toThrow();
expect(spy).not.toHaveBeenCalled();
});
it('should throw correctly if no callback is given', function() {
expect(function() {
testSubject.reduce();
}).toThrow();
});
it('should return the expected result', function() {
expect(testSubject.reduce(function(a,b) {
return (a||'').toString()+(b||'').toString();
})).toEqual('123');
});
it('should not directly affect the passed array', function() {
var copy = createArrayLikeFromArray(testSubject);
testSubject.reduce(function(a,b) {
return a+b;
});
delete(testSubject.reduce);
expect(testSubject).toEqual(copy);
});
it('should skip non-set values', function() {
delete testSubject[1];
var visited = {};
testSubject.reduce(function(a,b) {
if(a)
visited[a] = true;
if(b)
visited[b] = true;
return 0;
});
expect(visited).toEqual({ '1': true, '3': true });
});
it('should have the right length', function() {
expect(testSubject.reduce.length).toBe(1);
});
});
});
describe('reduceRight', function() {
beforeEach(function() {
testSubject = [1,2,3];
});
describe('Array', function() {
it('should pass the correct arguments to the callback', function() {
var spy = jasmine.createSpy().andReturn(0);
testSubject.reduceRight(spy);
expect(spy.calls[0].args).toExactlyMatch([3, 2, 1, testSubject]);
});
it('should start with the right initialValue', function() {
var spy = jasmine.createSpy().andReturn(0);
testSubject.reduceRight(spy, 0);
expect(spy.calls[0].args).toExactlyMatch([0, 3, 2, testSubject]);
});
it('should not affect elements added to the array after it has begun', function() {
var arr = [1,2,3],
i = 0;
arr.reduceRight(function(a, b) {
i++;
if(i <= 4) {
arr.push(a+3);
};
return b;
});
expect(arr).toEqual([1,2,3,6,5]);
expect(i).toBe(2);
});
it('should work as expected for empty arrays', function() {
var spy = jasmine.createSpy();
expect(function() {
[].reduceRight(spy);
}).toThrow();
expect(spy).not.toHaveBeenCalled();
});
it('should throw correctly if no callback is given', function() {
expect(function() {
testSubject.reduceRight();
}).toThrow();
});
it('should return the expected result', function() {
expect(testSubject.reduceRight(function(a,b) {
return (a||'').toString()+(b||'').toString();
})).toEqual('321');
});
it('should not directly affect the passed array', function() {
var copy = testSubject.slice();
testSubject.reduceRight(function(a,b) {
return a+b;
});
expect(testSubject).toEqual(copy);
});
it('should skip non-set values', function() {
delete testSubject[1];
var visited = {};
testSubject.reduceRight(function(a,b) {
if(a)
visited[a] = true;
if(b)
visited[b] = true;
return 0;
});
expect(visited).toEqual({ '1': true, '3': true });
});
it('should have the right length', function() {
expect(testSubject.reduceRight.length).toBe(1);
});
});
describe('Array-like objects', function() {
beforeEach(function() {
testSubject = createArrayLikeFromArray(testSubject);
testSubject.reduceRight = Array.prototype.reduceRight;
});
it('should pass the correct arguments to the callback', function() {
var spy = jasmine.createSpy().andReturn(0);
testSubject.reduceRight(spy);
expect(spy.calls[0].args).toExactlyMatch([3, 2, 1, testSubject]);
});
it('should start with the right initialValue', function() {
var spy = jasmine.createSpy().andReturn(0);
testSubject.reduceRight(spy, 0);
expect(spy.calls[0].args).toExactlyMatch([0, 3, 2, testSubject]);
});
it('should not affect elements added to the array after it has begun', function() {
var arr = createArrayLikeFromArray([1,2,3]),
i = 0;
Array.prototype.reduceRight.call(arr, function(a, b) {
i++;
if(i <= 4) {
arr[i+2] = a+3;
};
return b;
});
expect(arr).toEqual({
0: 1,
1: 2,
2: 3,
3: 6,
4: 5,
length: 3 // does not get updated on property assignment
});
expect(i).toBe(2);
});
it('should work as expected for empty arrays', function() {
var spy = jasmine.createSpy();
expect(function() {
Array.prototype.reduceRight.call({length:0}, spy);
}).toThrow();
expect(spy).not.toHaveBeenCalled();
});
it('should throw correctly if no callback is given', function() {
expect(function() {
testSubject.reduceRight();
}).toThrow();
});
it('should return the expected result', function() {
expect(testSubject.reduceRight(function(a,b) {
return (a||'').toString()+(b||'').toString();
})).toEqual('321');
});
it('should not directly affect the passed array', function() {
var copy = createArrayLikeFromArray(testSubject);
testSubject.reduceRight(function(a,b) {
return a+b;
});
delete(testSubject.reduceRight);
expect(testSubject).toEqual(copy);
});
it('should skip non-set values', function() {
delete testSubject[1];
var visited = {};
testSubject.reduceRight(function(a,b) {
if(a)
visited[a] = true;
if(b)
visited[b] = true;
return 0;
});
expect(visited).toEqual({ '1': true, '3': true });
});
it('should have the right length', function() {
expect(testSubject.reduceRight.length).toBe(1);
});
});
});
describe('isArray', function () {
it('should work for Array', function () {
var ret = Array.isArray([]);
expect(ret).toBe(true);
});
it('should fail for other objects', function () {
var objects = [
"someString",
true,
false,
42,
0,
{},
Object.create(null),
/foo/,
arguments,
document.getElementsByTagName("div")
];
objects.forEach(function (v) {
expect(Array.isArray(v)).toBe(false);
});
});
});
});
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