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40 lines
1.0 KiB
JavaScript
40 lines
1.0 KiB
JavaScript
6 years ago
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var createPadding = require('./_createPadding'),
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stringSize = require('./_stringSize'),
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toInteger = require('./toInteger'),
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toString = require('./toString');
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/**
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* Pads `string` on the left side if it's shorter than `length`. Padding
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* characters are truncated if they exceed `length`.
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category String
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* @param {string} [string=''] The string to pad.
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* @param {number} [length=0] The padding length.
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* @param {string} [chars=' '] The string used as padding.
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* @returns {string} Returns the padded string.
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* @example
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*
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* _.padStart('abc', 6);
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* // => ' abc'
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*
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* _.padStart('abc', 6, '_-');
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* // => '_-_abc'
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*
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* _.padStart('abc', 3);
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* // => 'abc'
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*/
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function padStart(string, length, chars) {
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string = toString(string);
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length = toInteger(length);
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var strLength = length ? stringSize(string) : 0;
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return (length && strLength < length)
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? (createPadding(length - strLength, chars) + string)
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: string;
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}
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module.exports = padStart;
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