mirror of
https://github.com/thangisme/notes.git
synced 2024-11-09 07:37:34 -05:00
26 lines
464 B
JavaScript
26 lines
464 B
JavaScript
'use strict';
|
|
module.exports = function (arr, predicate, ctx) {
|
|
if (typeof Array.prototype.findIndex === 'function') {
|
|
return arr.findIndex(predicate, ctx);
|
|
}
|
|
|
|
if (typeof predicate !== 'function') {
|
|
throw new TypeError('predicate must be a function');
|
|
}
|
|
|
|
var list = Object(arr);
|
|
var len = list.length;
|
|
|
|
if (len === 0) {
|
|
return -1;
|
|
}
|
|
|
|
for (var i = 0; i < len; i++) {
|
|
if (predicate.call(ctx, list[i], i, list)) {
|
|
return i;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
};
|