55 lines
1.2 KiB
JavaScript
55 lines
1.2 KiB
JavaScript
|
var _curry2 =
|
||
|
|
/*#__PURE__*/
|
||
|
|
require("./internal/_curry2");
|
||
|
|
|
||
|
|
var _dispatchable =
|
||
|
|
/*#__PURE__*/
|
||
|
|
require("./internal/_dispatchable");
|
||
|
|
|
||
|
|
var _xfind =
|
||
|
|
/*#__PURE__*/
|
||
|
|
require("./internal/_xfind");
|
||
|
|
/**
|
||
|
|
* Returns the first element of the list which matches the predicate, or
|
||
|
|
* `undefined` if no element matches.
|
||
|
|
*
|
||
|
|
* Dispatches to the `find` method of the second argument, if present.
|
||
|
|
*
|
||
|
|
* Acts as a transducer if a transformer is given in list position.
|
||
|
|
*
|
||
|
|
* @func
|
||
|
|
* @memberOf R
|
||
|
|
* @since v0.1.0
|
||
|
|
* @category List
|
||
|
|
* @sig (a -> Boolean) -> [a] -> a | undefined
|
||
|
|
* @param {Function} fn The predicate function used to determine if the element is the
|
||
|
|
* desired one.
|
||
|
|
* @param {Array} list The array to consider.
|
||
|
|
* @return {Object} The element found, or `undefined`.
|
||
|
|
* @see R.transduce
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* const xs = [{a: 1}, {a: 2}, {a: 3}];
|
||
|
|
* R.find(R.propEq('a', 2))(xs); //=> {a: 2}
|
||
|
|
* R.find(R.propEq('a', 4))(xs); //=> undefined
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
var find =
|
||
|
|
/*#__PURE__*/
|
||
|
|
_curry2(
|
||
|
|
/*#__PURE__*/
|
||
|
|
_dispatchable(['find'], _xfind, function find(fn, list) {
|
||
|
|
var idx = 0;
|
||
|
|
var len = list.length;
|
||
|
|
|
||
|
|
while (idx < len) {
|
||
|
|
if (fn(list[idx])) {
|
||
|
|
return list[idx];
|
||
|
|
}
|
||
|
|
|
||
|
|
idx += 1;
|
||
|
|
}
|
||
|
|
}));
|
||
|
|
|
||
|
|
module.exports = find;
|