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25 lines
401 B
JavaScript

'use strict';
var isFinite = require('is-finite');
module.exports = function (str, n) {
if (typeof str !== 'string') {
throw new TypeError('Expected `input` to be a string');
}
if (n < 0 || !isFinite(n)) {
throw new TypeError('Expected `count` to be a positive finite number');
}
var ret = '';
do {
if (n & 1) {
ret += str;
}
str += str;
} while ((n >>= 1));
return ret;
};