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Add _.nthArg.

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John-David Dalton
2015-10-24 00:37:03 -07:00
parent 655f7918ea
commit 7be7acfe30
2 changed files with 29 additions and 6 deletions
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33
lodash.js
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@@ -1424,11 +1424,11 @@
* `functions`, `groupBy`, `initial`, `intersection`, `intersectionBy`, * `functions`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
* `invert`, `invoke`, `iteratee`, `keyBy`, `keys`, `keysIn`, `map`, `mapKeys`, * `invert`, `invoke`, `iteratee`, `keyBy`, `keys`, `keysIn`, `map`, `mapKeys`,
* `mapValues`, `matches`, `matchesProperty`, `memoize`, `merge`, `mergeWith`, * `mapValues`, `matches`, `matchesProperty`, `memoize`, `merge`, `mergeWith`,
* `method`, `methodOf`, `mixin`, `modArgs`, `modArgsSet', 'negate`, `omit`, * `method`, `methodOf`, `mixin`, `modArgs`, `modArgsSet', 'negate`, `nthArg`,
* `omitBy`, `once`, `pairs`, `partial`, `partialRight`, `partition`, `pick`, * `omit`, `omitBy`, `once`, `pairs`, `partial`, `partialRight`, `partition`,
* `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`, * `pick`, `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`,
* `pullAt`, `push`, `range`, `rearg`, `reject`, `remove`, `rest`, `reverse`, * `pullAllBy`, `pullAt`, `push`, `range`, `rearg`, `reject`, `remove`, `rest`,
* `sampleSize`, `set`, `setWith`, `shuffle`, `slice`, `sort`, `sortBy`, * `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`, `slice`, `sort`, `sortBy`,
* `sortByOrder`, `splice`, `spread`, `tail`, `take`, `takeRight`, `takeRightWhile`, * `sortByOrder`, `splice`, `spread`, `tail`, `take`, `takeRight`, `takeRightWhile`,
* `takeWhile`, `tap`, `throttle`, `thru`, `times`, `toArray`, `toPath`, * `takeWhile`, `tap`, `throttle`, `thru`, `times`, `toArray`, `toPath`,
* `toPlainObject`, `transform`, `union`, `unionBy`, `uniq`, `uniqBy`, `unset`, * `toPlainObject`, `transform`, `union`, `unionBy`, `uniq`, `uniqBy`, `unset`,
@@ -12505,6 +12505,28 @@
// No operation performed. // No operation performed.
} }
/**
* Creates a function that returns its nth argument.
*
* @static
* @memberOf _
* @category Utility
* @param {number} [n=0] The index of the argument to return.
* @returns {Function} Returns the new function.
* @example
*
* var func = _.nthArg(1);
*
* func('a', 'b', 'c');
* // => 'b'
*/
function nthArg(n) {
n = toInteger(n);
return function() {
return arguments[n];
};
}
/** /**
* Creates a function that returns the value at `path` of a given object. * Creates a function that returns the value at `path` of a given object.
* *
@@ -13050,6 +13072,7 @@
lodash.modArgs = modArgs; lodash.modArgs = modArgs;
lodash.modArgsSet = modArgsSet; lodash.modArgsSet = modArgsSet;
lodash.negate = negate; lodash.negate = negate;
lodash.nthArg = nthArg;
lodash.omit = omit; lodash.omit = omit;
lodash.omitBy = omitBy; lodash.omitBy = omitBy;
lodash.once = once; lodash.once = once;

2
test/test.js
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@@ -21768,7 +21768,7 @@
var acceptFalsey = lodashStable.difference(allMethods, rejectFalsey); var acceptFalsey = lodashStable.difference(allMethods, rejectFalsey);
QUnit.test('should accept falsey arguments', function(assert) { QUnit.test('should accept falsey arguments', function(assert) {
assert.expect(262); assert.expect(263);
var emptyArrays = lodashStable.map(falsey, lodashStable.constant([])); var emptyArrays = lodashStable.map(falsey, lodashStable.constant([]));