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