forked from robertkrimen/otto
/
underscore_arrays_test.go
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/
underscore_arrays_test.go
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package otto
import (
"testing"
)
// first
func Test_underscore_arrays_0(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("first", function() {
equal(_.first([1,2,3]), 1, 'can pull out the first element of an array');
equal(_([1, 2, 3]).first(), 1, 'can perform OO-style "first()"');
equal(_.first([1,2,3], 0).join(', '), "", 'can pass an index to first');
equal(_.first([1,2,3], 2).join(', '), '1, 2', 'can pass an index to first');
equal(_.first([1,2,3], 5).join(', '), '1, 2, 3', 'can pass an index to first');
var result = (function(){ return _.first(arguments); })(4, 3, 2, 1);
equal(result, 4, 'works on an arguments object.');
result = _.map([[1,2,3],[1,2,3]], _.first);
equal(result.join(','), '1,1', 'works well with _.map');
result = (function() { return _.take([1,2,3], 2); })();
equal(result.join(','), '1,2', 'aliased as take');
equal(_.first(null), undefined, 'handles nulls');
});
`)
})
}
// rest
func Test_underscore_arrays_1(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("rest", function() {
var numbers = [1, 2, 3, 4];
equal(_.rest(numbers).join(", "), "2, 3, 4", 'working rest()');
equal(_.rest(numbers, 0).join(", "), "1, 2, 3, 4", 'working rest(0)');
equal(_.rest(numbers, 2).join(', '), '3, 4', 'rest can take an index');
var result = (function(){ return _(arguments).tail(); })(1, 2, 3, 4);
equal(result.join(', '), '2, 3, 4', 'aliased as tail and works on arguments object');
result = _.map([[1,2,3],[1,2,3]], _.rest);
equal(_.flatten(result).join(','), '2,3,2,3', 'works well with _.map');
result = (function(){ return _(arguments).drop(); })(1, 2, 3, 4);
equal(result.join(', '), '2, 3, 4', 'aliased as drop and works on arguments object');
});
`)
})
}
// initial
func Test_underscore_arrays_2(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("initial", function() {
equal(_.initial([1,2,3,4,5]).join(", "), "1, 2, 3, 4", 'working initial()');
equal(_.initial([1,2,3,4],2).join(", "), "1, 2", 'initial can take an index');
var result = (function(){ return _(arguments).initial(); })(1, 2, 3, 4);
equal(result.join(", "), "1, 2, 3", 'initial works on arguments object');
result = _.map([[1,2,3],[1,2,3]], _.initial);
equal(_.flatten(result).join(','), '1,2,1,2', 'initial works with _.map');
});
`)
})
}
// last
func Test_underscore_arrays_3(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("last", function() {
equal(_.last([1,2,3]), 3, 'can pull out the last element of an array');
equal(_.last([1,2,3], 0).join(', '), "", 'can pass an index to last');
equal(_.last([1,2,3], 2).join(', '), '2, 3', 'can pass an index to last');
equal(_.last([1,2,3], 5).join(', '), '1, 2, 3', 'can pass an index to last');
var result = (function(){ return _(arguments).last(); })(1, 2, 3, 4);
equal(result, 4, 'works on an arguments object');
result = _.map([[1,2,3],[1,2,3]], _.last);
equal(result.join(','), '3,3', 'works well with _.map');
equal(_.last(null), undefined, 'handles nulls');
});
`)
})
}
// compact
func Test_underscore_arrays_4(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("compact", function() {
equal(_.compact([0, 1, false, 2, false, 3]).length, 3, 'can trim out all falsy values');
var result = (function(){ return _.compact(arguments).length; })(0, 1, false, 2, false, 3);
equal(result, 3, 'works on an arguments object');
});
`)
})
}
// flatten
func Test_underscore_arrays_5(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("flatten", function() {
var list = [1, [2], [3, [[[4]]]]];
deepEqual(_.flatten(list), [1,2,3,4], 'can flatten nested arrays');
deepEqual(_.flatten(list, true), [1,2,3,[[[4]]]], 'can shallowly flatten nested arrays');
var result = (function(){ return _.flatten(arguments); })(1, [2], [3, [[[4]]]]);
deepEqual(result, [1,2,3,4], 'works on an arguments object');
});
`)
})
}
// without
func Test_underscore_arrays_6(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("without", function() {
var list = [1, 2, 1, 0, 3, 1, 4];
equal(_.without(list, 0, 1).join(', '), '2, 3, 4', 'can remove all instances of an object');
var result = (function(){ return _.without(arguments, 0, 1); })(1, 2, 1, 0, 3, 1, 4);
equal(result.join(', '), '2, 3, 4', 'works on an arguments object');
var list = [{one : 1}, {two : 2}];
ok(_.without(list, {one : 1}).length == 2, 'uses real object identity for comparisons.');
ok(_.without(list, list[0]).length == 1, 'ditto.');
});
`)
})
}
// uniq
func Test_underscore_arrays_7(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("uniq", function() {
var list = [1, 2, 1, 3, 1, 4];
equal(_.uniq(list).join(', '), '1, 2, 3, 4', 'can find the unique values of an unsorted array');
var list = [1, 1, 1, 2, 2, 3];
equal(_.uniq(list, true).join(', '), '1, 2, 3', 'can find the unique values of a sorted array faster');
var list = [{name:'moe'}, {name:'curly'}, {name:'larry'}, {name:'curly'}];
var iterator = function(value) { return value.name; };
equal(_.map(_.uniq(list, false, iterator), iterator).join(', '), 'moe, curly, larry', 'can find the unique values of an array using a custom iterator');
equal(_.map(_.uniq(list, iterator), iterator).join(', '), 'moe, curly, larry', 'can find the unique values of an array using a custom iterator without specifying whether array is sorted');
var iterator = function(value) { return value +1; };
var list = [1, 2, 2, 3, 4, 4];
equal(_.uniq(list, true, iterator).join(', '), '1, 2, 3, 4', 'iterator works with sorted array');
var result = (function(){ return _.uniq(arguments); })(1, 2, 1, 3, 1, 4);
equal(result.join(', '), '1, 2, 3, 4', 'works on an arguments object');
});
`)
})
}
// intersection
func Test_underscore_arrays_8(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("intersection", function() {
var stooges = ['moe', 'curly', 'larry'], leaders = ['moe', 'groucho'];
equal(_.intersection(stooges, leaders).join(''), 'moe', 'can take the set intersection of two arrays');
equal(_(stooges).intersection(leaders).join(''), 'moe', 'can perform an OO-style intersection');
var result = (function(){ return _.intersection(arguments, leaders); })('moe', 'curly', 'larry');
equal(result.join(''), 'moe', 'works on an arguments object');
});
`)
})
}
// union
func Test_underscore_arrays_9(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("union", function() {
var result = _.union([1, 2, 3], [2, 30, 1], [1, 40]);
equal(result.join(' '), '1 2 3 30 40', 'takes the union of a list of arrays');
var result = _.union([1, 2, 3], [2, 30, 1], [1, 40, [1]]);
equal(result.join(' '), '1 2 3 30 40 1', 'takes the union of a list of nested arrays');
});
`)
})
}
// difference
func Test_underscore_arrays_10(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("difference", function() {
var result = _.difference([1, 2, 3], [2, 30, 40]);
equal(result.join(' '), '1 3', 'takes the difference of two arrays');
var result = _.difference([1, 2, 3, 4], [2, 30, 40], [1, 11, 111]);
equal(result.join(' '), '3 4', 'takes the difference of three arrays');
});
`)
})
}
// zip
func Test_underscore_arrays_11(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test('zip', function() {
var names = ['moe', 'larry', 'curly'], ages = [30, 40, 50], leaders = [true];
var stooges = _.zip(names, ages, leaders);
equal(String(stooges), 'moe,30,true,larry,40,,curly,50,', 'zipped together arrays of different lengths');
});
`)
})
}
// object
func Test_underscore_arrays_12(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test('object', function() {
var result = _.object(['moe', 'larry', 'curly'], [30, 40, 50]);
var shouldBe = {moe: 30, larry: 40, curly: 50};
ok(_.isEqual(result, shouldBe), 'two arrays zipped together into an object');
result = _.object([['one', 1], ['two', 2], ['three', 3]]);
shouldBe = {one: 1, two: 2, three: 3};
ok(_.isEqual(result, shouldBe), 'an array of pairs zipped together into an object');
var stooges = {moe: 30, larry: 40, curly: 50};
ok(_.isEqual(_.object(_.pairs(stooges)), stooges), 'an object converted to pairs and back to an object');
ok(_.isEqual(_.object(null), {}), 'handles nulls');
});
`)
})
}
// indexOf
func Test_underscore_arrays_13(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("indexOf", function() {
var numbers = [1, 2, 3];
numbers.indexOf = null;
equal(_.indexOf(numbers, 2), 1, 'can compute indexOf, even without the native function');
var result = (function(){ return _.indexOf(arguments, 2); })(1, 2, 3);
equal(result, 1, 'works on an arguments object');
equal(_.indexOf(null, 2), -1, 'handles nulls properly');
var numbers = [10, 20, 30, 40, 50], num = 35;
var index = _.indexOf(numbers, num, true);
equal(index, -1, '35 is not in the list');
numbers = [10, 20, 30, 40, 50]; num = 40;
index = _.indexOf(numbers, num, true);
equal(index, 3, '40 is in the list');
numbers = [1, 40, 40, 40, 40, 40, 40, 40, 50, 60, 70]; num = 40;
index = _.indexOf(numbers, num, true);
equal(index, 1, '40 is in the list');
numbers = [1, 2, 3, 1, 2, 3, 1, 2, 3];
index = _.indexOf(numbers, 2, 5);
equal(index, 7, 'supports the fromIndex argument');
});
`)
})
}
// lastIndexOf
func Test_underscore_arrays_14(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("lastIndexOf", function() {
var numbers = [1, 0, 1];
equal(_.lastIndexOf(numbers, 1), 2);
numbers = [1, 0, 1, 0, 0, 1, 0, 0, 0];
numbers.lastIndexOf = null;
equal(_.lastIndexOf(numbers, 1), 5, 'can compute lastIndexOf, even without the native function');
equal(_.lastIndexOf(numbers, 0), 8, 'lastIndexOf the other element');
var result = (function(){ return _.lastIndexOf(arguments, 1); })(1, 0, 1, 0, 0, 1, 0, 0, 0);
equal(result, 5, 'works on an arguments object');
equal(_.indexOf(null, 2), -1, 'handles nulls properly');
numbers = [1, 2, 3, 1, 2, 3, 1, 2, 3];
var index = _.lastIndexOf(numbers, 2, 2);
equal(index, 1, 'supports the fromIndex argument');
});
`)
})
}
// range
func Test_underscore_arrays_15(t *testing.T) {
tt(t, func() {
test, _ := test_()
test(`
test("range", function() {
equal(_.range(0).join(''), '', 'range with 0 as a first argument generates an empty array');
equal(_.range(4).join(' '), '0 1 2 3', 'range with a single positive argument generates an array of elements 0,1,2,...,n-1');
equal(_.range(5, 8).join(' '), '5 6 7', 'range with two arguments a & b, a<b generates an array of elements a,a+1,a+2,...,b-2,b-1');
equal(_.range(8, 5).join(''), '', 'range with two arguments a & b, b<a generates an empty array');
equal(_.range(3, 10, 3).join(' '), '3 6 9', 'range with three arguments a & b & c, c < b-a, a < b generates an array of elements a,a+c,a+2c,...,b - (multiplier of a) < c');
equal(_.range(3, 10, 15).join(''), '3', 'range with three arguments a & b & c, c > b-a, a < b generates an array with a single element, equal to a');
equal(_.range(12, 7, -2).join(' '), '12 10 8', 'range with three arguments a & b & c, a > b, c < 0 generates an array of elements a,a-c,a-2c and ends with the number not less than b');
equal(_.range(0, -10, -1).join(' '), '0 -1 -2 -3 -4 -5 -6 -7 -8 -9', 'final example in the Python docs');
});
`)
})
}