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Add support for maps in _.pairs method ...Closes #2517 #2523

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Add support for maps in _.pairs method ...Closes #2517 #2523

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675c8d2
Closes #2517
penDerGraft May 2, 2016
742033f
remove call to Array.from to fix failing tests in node 0.12
penDerGraft May 2, 2016
5355cc6
Add mapToArray helper function and refactor pairs to use it. issue #2517
penDerGraft May 3, 2016
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6 changes: 6 additions & 0 deletions test/objects.js
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Original file line number Diff line number Diff line change
Expand Up @@ -81,6 +81,12 @@
QUnit.test('pairs', function(assert) {
assert.deepEqual(_.pairs({one: 1, two: 2}), [['one', 1], ['two', 2]], 'can convert an object into pairs');
assert.deepEqual(_.pairs({one: 1, two: 2, length: 3}), [['one', 1], ['two', 2], ['length', 3]], '... even when one of them is "length"');
if (typeof Map === 'function') {
var mapObj = new Map();
mapObj.set('one', 1);
mapObj.set('two', 2);
assert.deepEqual(_.pairs(mapObj), [['one', 1], ['two', 2]], '... or when object is a Map');
}
});

QUnit.test('invert', function(assert) {
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10 changes: 10 additions & 0 deletions underscore.js
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Expand Up @@ -435,6 +435,15 @@
if (_.has(result, key)) result[key]++; else result[key] = 1;
});

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For this PR I just made the change in _.pairs, but the helper function allows quick checks in other underscore functions as well, as @jdalton mentioned (i.e. _.toArray).

var mapToArray = function(map) {
var index = -1;
var result = Array(map.size);
map.forEach(function(value, key) {
result[++index] = [key, value];
});
return result;
};

var reStrSymbol = /[^\ud800-\udfff]|[\ud800-\udbff][\udc00-\udfff]|[\ud800-\udfff]/g;
// Safely create a real, live array from anything iterable.
_.toArray = function(obj) {
Expand Down Expand Up @@ -1009,6 +1018,7 @@

// Convert an object into a list of `[key, value]` pairs.
_.pairs = function(obj) {
if (_.isMap(obj)) return mapToArray(obj);
var keys = _.keys(obj);
var length = keys.length;
var pairs = Array(length);
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