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- module.exports = function (xs, fn) {
- var res = [];
- for (var i = 0; i < xs.length; i++) {
- var x = fn(xs[i], i);
- if (isArray(x)) res.push.apply(res, x);
- else res.push(x);
- }
- return res;
- };
- var isArray = Array.isArray || function (xs) {
- return Object.prototype.toString.call(xs) === '[object Array]';
- };
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