- 'use strict';
- var log = Math.log, LOG10E = Math.LOG10E;
- module.exports = function (x) {
- if (isNaN(x)) return NaN;
- x = Number(x);
- if (x < 0) return NaN;
- if (x === 0) return -Infinity;
- if (x === 1) return 0;
- if (x === Infinity) return Infinity;
- return log(x) * LOG10E;
- };
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