Last change
on this file since 6fe77af was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
|
-
Property mode
set to
100644
|
File size:
952 bytes
|
Line | |
---|
1 | /** Used as references for various `Number` constants. */
|
---|
2 | var MAX_SAFE_INTEGER = 9007199254740991;
|
---|
3 |
|
---|
4 | /* Built-in method references for those with the same name as other `lodash` methods. */
|
---|
5 | var nativeFloor = Math.floor;
|
---|
6 |
|
---|
7 | /**
|
---|
8 | * The base implementation of `_.repeat` which doesn't coerce arguments.
|
---|
9 | *
|
---|
10 | * @private
|
---|
11 | * @param {string} string The string to repeat.
|
---|
12 | * @param {number} n The number of times to repeat the string.
|
---|
13 | * @returns {string} Returns the repeated string.
|
---|
14 | */
|
---|
15 | function baseRepeat(string, n) {
|
---|
16 | var result = '';
|
---|
17 | if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
|
---|
18 | return result;
|
---|
19 | }
|
---|
20 | // Leverage the exponentiation by squaring algorithm for a faster repeat.
|
---|
21 | // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
|
---|
22 | do {
|
---|
23 | if (n % 2) {
|
---|
24 | result += string;
|
---|
25 | }
|
---|
26 | n = nativeFloor(n / 2);
|
---|
27 | if (n) {
|
---|
28 | string += string;
|
---|
29 | }
|
---|
30 | } while (n);
|
---|
31 |
|
---|
32 | return result;
|
---|
33 | }
|
---|
34 |
|
---|
35 | module.exports = baseRepeat;
|
---|
Note:
See
TracBrowser
for help on using the repository browser.