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12 lines
245 B
JavaScript
12 lines
245 B
JavaScript
'use strict';
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var toString = Object.prototype.toString
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, id = toString.call(1);
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module.exports = function (x) {
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return ((typeof x === 'number') ||
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((x instanceof Number) ||
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((typeof x === 'object') && (toString.call(x) === id))));
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};
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