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var baseFindIndex = require('./_baseFindIndex'), | |
baseIteratee = require('./_baseIteratee'), | |
toInteger = require('./toInteger'); | |
/* Built-in method references for those with the same name as other `lodash` methods. */ | |
var nativeMax = Math.max, | |
nativeMin = Math.min; | |
/** | |
* This method is like `_.findIndex` except that it iterates over elements | |
* of `collection` from right to left. | |
* | |
* @static | |
* @memberOf _ | |
* @since 2.0.0 | |
* @category Array | |
* @param {Array} array The array to inspect. | |
* @param {Function} [predicate=_.identity] The function invoked per iteration. | |
* @param {number} [fromIndex=array.length-1] The index to search from. | |
* @returns {number} Returns the index of the found element, else `-1`. | |
* @example | |
* | |
* var users = [ | |
* { 'user': 'barney', 'active': true }, | |
* { 'user': 'fred', 'active': false }, | |
* { 'user': 'pebbles', 'active': false } | |
* ]; | |
* | |
* _.findLastIndex(users, function(o) { return o.user == 'pebbles'; }); | |
* // => 2 | |
* | |
* // The `_.matches` iteratee shorthand. | |
* _.findLastIndex(users, { 'user': 'barney', 'active': true }); | |
* // => 0 | |
* | |
* // The `_.matchesProperty` iteratee shorthand. | |
* _.findLastIndex(users, ['active', false]); | |
* // => 2 | |
* | |
* // The `_.property` iteratee shorthand. | |
* _.findLastIndex(users, 'active'); | |
* // => 0 | |
*/ | |
function findLastIndex(array, predicate, fromIndex) { | |
var length = array == null ? 0 : array.length; | |
if (!length) { | |
return -1; | |
} | |
var index = length - 1; | |
if (fromIndex !== undefined) { | |
index = toInteger(fromIndex); | |
index = fromIndex < 0 | |
? nativeMax(length + index, 0) | |
: nativeMin(index, length - 1); | |
} | |
return baseFindIndex(array, baseIteratee(predicate, 3), index, true); | |
} | |
module.exports = findLastIndex; | |