mirror of
https://github.com/whoisclebs/lodash.git
synced 2026-02-03 16:47:49 +00:00
88 lines
3.1 KiB
JavaScript
88 lines
3.1 KiB
JavaScript
/**
|
|
* lodash 3.0.0 (Custom Build) <https://lodash.com/>
|
|
* Build: `lodash modern modularize exports="npm" -o ./`
|
|
* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
|
|
* Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
|
|
* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
|
|
* Available under MIT license <https://lodash.com/license>
|
|
*/
|
|
var baseCallback = require('lodash._basecallback'),
|
|
baseEach = require('lodash._baseeach'),
|
|
isIterateeCall = require('lodash._isiterateecall'),
|
|
toIterable = require('lodash._toiterable'),
|
|
isArray = require('lodash.isarray'),
|
|
isString = require('lodash.isstring');
|
|
|
|
/**
|
|
* Used by `_.max` and `_.min` as the default callback for string values.
|
|
*
|
|
* @private
|
|
* @param {string} string The string to inspect.
|
|
* @returns {number} Returns the code unit of the first character of the string.
|
|
*/
|
|
function charAtCallback(string) {
|
|
return string.charCodeAt(0);
|
|
}
|
|
|
|
/** Used as references for `-Infinity` and `Infinity`. */
|
|
var NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY,
|
|
POSITIVE_INFINITY = Number.POSITIVE_INFINITY;
|
|
|
|
/**
|
|
* Creates a function that gets the extremum value of a collection.
|
|
*
|
|
* @private
|
|
* @param {Function} arrayFunc The function to get the extremum value from an array.
|
|
* @param {boolean} [isMin] Specify returning the minimum, instead of the maximum,
|
|
* extremum value.
|
|
* @returns {Function} Returns the new extremum function.
|
|
*/
|
|
function createExtremum(arrayFunc, isMin) {
|
|
return function(collection, iteratee, thisArg) {
|
|
if (thisArg && isIterateeCall(collection, iteratee, thisArg)) {
|
|
iteratee = null;
|
|
}
|
|
var noIteratee = iteratee == null;
|
|
|
|
iteratee = noIteratee ? iteratee : baseCallback(iteratee, thisArg, 3);
|
|
if (noIteratee) {
|
|
var isArr = isArray(collection);
|
|
if (!isArr && isString(collection)) {
|
|
iteratee = charAtCallback;
|
|
} else {
|
|
return arrayFunc(isArr ? collection : toIterable(collection));
|
|
}
|
|
}
|
|
return extremumBy(collection, iteratee, isMin);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Gets the extremum value of `collection` invoking `iteratee` for each value
|
|
* in `collection` to generate the criterion by which the value is ranked.
|
|
* The `iteratee` is invoked with three arguments; (value, index, collection).
|
|
*
|
|
* @private
|
|
* @param {Array|Object|string} collection The collection to iterate over.
|
|
* @param {Function} iteratee The function invoked per iteration.
|
|
* @param {boolean} [isMin] Specify returning the minimum, instead of the
|
|
* maximum, extremum value.
|
|
* @returns {*} Returns the extremum value.
|
|
*/
|
|
function extremumBy(collection, iteratee, isMin) {
|
|
var exValue = isMin ? POSITIVE_INFINITY : NEGATIVE_INFINITY,
|
|
computed = exValue,
|
|
result = computed;
|
|
|
|
baseEach(collection, function(value, index, collection) {
|
|
var current = iteratee(value, index, collection);
|
|
if ((isMin ? current < computed : current > computed) || (current === exValue && current === result)) {
|
|
computed = current;
|
|
result = value;
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
|
|
module.exports = createExtremum;
|