blob: 2902123e6d458b349c490ed26c76d80b7390f6b4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
var baseToString = require('../internal/baseToString');
/* Native method references for those with the same name as other `lodash` methods. */
var nativeFloor = Math.floor,
nativeIsFinite = global.isFinite;
/**
* Repeats the given string `n` times.
*
* @static
* @memberOf _
* @category String
* @param {string} [string=''] The string to repeat.
* @param {number} [n=0] The number of times to repeat the string.
* @returns {string} Returns the repeated string.
* @example
*
* _.repeat('*', 3);
* // => '***'
*
* _.repeat('abc', 2);
* // => 'abcabc'
*
* _.repeat('abc', 0);
* // => ''
*/
function repeat(string, n) {
var result = '';
string = baseToString(string);
n = +n;
if (n < 1 || !string || !nativeIsFinite(n)) {
return result;
}
// Leverage the exponentiation by squaring algorithm for a faster repeat.
// See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
do {
if (n % 2) {
result += string;
}
n = nativeFloor(n / 2);
string += string;
} while (n);
return result;
}
module.exports = repeat;
|
