12 lines
280 B
JavaScript
12 lines
280 B
JavaScript
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module.exports = function (xs, f) {
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if (xs.map) return xs.map(f);
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var res = [];
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for (var i = 0; i < xs.length; i++) {
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var x = xs[i];
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if (hasOwn.call(xs, i)) res.push(f(x, i, xs));
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}
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return res;
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};
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var hasOwn = Object.prototype.hasOwnProperty;
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