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30 lines
559 B
30 lines
559 B
/*! |
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* array-last <https://github.com/jonschlinkert/array-last> |
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* |
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* Copyright (c) 2014-2017, Jon Schlinkert. |
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* Released under the MIT License. |
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*/ |
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var isNumber = require('is-number'); |
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module.exports = function last(arr, n) { |
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if (!Array.isArray(arr)) { |
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throw new Error('expected the first argument to be an array'); |
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} |
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var len = arr.length; |
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if (len === 0) { |
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return null; |
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} |
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n = isNumber(n) ? +n : 1; |
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if (n === 1) { |
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return arr[len - 1]; |
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} |
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var res = new Array(n); |
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while (n--) { |
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res[n] = arr[--len]; |
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} |
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return res; |
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};
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