createFind.js
932 Bytes
define(['./baseCallback', './baseFind', './baseFindIndex', '../lang/isArray'], function(baseCallback, baseFind, baseFindIndex, isArray) {
/** Used as a safe reference for `undefined` in pre-ES5 environments. */
var undefined;
/**
* Creates a `_.find` or `_.findLast` function.
*
* @private
* @param {Function} eachFunc The function to iterate over a collection.
* @param {boolean} [fromRight] Specify iterating from right to left.
* @returns {Function} Returns the new find function.
*/
function createFind(eachFunc, fromRight) {
return function(collection, predicate, thisArg) {
predicate = baseCallback(predicate, thisArg, 3);
if (isArray(collection)) {
var index = baseFindIndex(collection, predicate, fromRight);
return index > -1 ? collection[index] : undefined;
}
return baseFind(collection, predicate, eachFunc);
};
}
return createFind;
});