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change .grab to .at, add unlimited args or numbers or arrays and simplify function call to use values and pick

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Former-commit-id: 3deb82ad9f55cd7261453a40bb0f046a5340790d
This commit is contained in:
Dan Heberden
2012-12-18 12:52:44 -08:00
parent 2ae0e9d902
commit c86a16df7f
2 changed files with 28 additions and 28 deletions
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44
lodash.js
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@@ -1937,6 +1937,29 @@
/*--------------------------------------------------------------------------*/
/**
* Retrieves the elements in the `collection` at specified indexes. Indexes may
* be specified as individual arguments or as arrays of indexes.
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object|String} collection The collection to iterate over.
* @param {Number|Array} number|[index1, index2, ...] The index(es) of `collection`
* to retrieve, either as individual arguments or arrays.
* @returns {Array} Returns a new array of elements that matched the provided indexes.
* @example
*
* _.at( ['a', 'b', 'c', 'd', 'e', 'f'], [0, 2, 5] );
* // => ['a', 'c', 'f']
*
* _.at( ['lodash', 'javascript', 'fast'], 0, 2 );
* // => ['lodash, 'fast']
*/
function at(collection, list) {
return values(pick(collection || [], concat.apply(arguments, slice(arguments, 1))));
}
/**
* Checks if a given `target` element is present in a `collection` using strict
* equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
@@ -2175,25 +2198,6 @@
return collection;
}
/**
* Grabs the elements in the `collection` using the specified indexes
* in the `list` array.
*
* @static
* @memberOf _
* @category Collections
* @param {Array|Object|String} collection The collection to iterate over.
* @param {Array} list The array of indexes to grab.
* @ returns {Array} Returns a new array of elements that matched the list array.
* @example
*
* _.grab( ['a', 'b', 'c', 'd', 'e', 'f'], [0, 2, 5] );
* // => ['a', 'c', 'f']
*/
function grab(collection, list) {
return invoke(list, function(a){ return a[this]; }, collection);
}
/**
* Creates an object composed of keys returned from running each element of
* `collection` through a `callback`. The corresponding value of each key is an
@@ -4241,6 +4245,7 @@
// add functions that return wrapped values when chaining
lodash.after = after;
lodash.assign = assign;
lodash.at = at;
lodash.bind = bind;
lodash.bindAll = bindAll;
lodash.bindKey = bindKey;
@@ -4258,7 +4263,6 @@
lodash.forIn = forIn;
lodash.forOwn = forOwn;
lodash.functions = functions;
lodash.grab = grab;
lodash.groupBy = groupBy;
lodash.initial = initial;
lodash.intersection = intersection;

12
test/test.js
View File

@@ -667,23 +667,19 @@
/*--------------------------------------------------------------------------*/
QUnit.module('lodash.grab');
QUnit.module('lodash.at');
(function() {
test('should get items in range', function() {
var result = _.grab(['a', 'b', 1.4, 'c', { 'foo': 'bar' }, 'd'], [0, 2, 4]);
var result = _.at(['a', 'b', 1.4, 'c', { 'foo': 'bar' }, 'd'], [0, 2, 4]);
deepEqual( result, ['a', 1.4, { 'foo': 'bar' } ]);
});
test('should work with an object for `collection`', function() {
var result = _.grab({ 'a': 'apple', 'b': 'ball', 'c': 'count' }, ['a', 'c']);
var result = _.at({ 'a': 'apple', 'b': 'ball', 'c': 'count' }, ['a', 'c']);
deepEqual(result, ['apple', 'count']);
});
test('no list should return an empty array', function() {
deepEqual(_.grab(['a', 'b', 'c']), [] );
});
test('out of range selections should return undefined', function() {
var result = _.grab(['a', 'b', 'c'], [1, 9001]);
deepEqual( result, ['b', undefined]);
deepEqual(_.at(['a', 'b', 'c']), [] );
});
}());