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40 lines
1017 B
JavaScript
40 lines
1017 B
JavaScript
6 years ago
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var baseClamp = require('./_baseClamp'),
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baseToString = require('./_baseToString'),
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toInteger = require('./toInteger'),
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toString = require('./toString');
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/**
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* Checks if `string` starts with the given target string.
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*
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* @static
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* @memberOf _
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* @since 3.0.0
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* @category String
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* @param {string} [string=''] The string to inspect.
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* @param {string} [target] The string to search for.
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* @param {number} [position=0] The position to search from.
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* @returns {boolean} Returns `true` if `string` starts with `target`,
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* else `false`.
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* @example
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*
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* _.startsWith('abc', 'a');
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* // => true
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*
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* _.startsWith('abc', 'b');
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* // => false
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*
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* _.startsWith('abc', 'b', 1);
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* // => true
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*/
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function startsWith(string, target, position) {
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string = toString(string);
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position = position == null
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? 0
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: baseClamp(toInteger(position), 0, string.length);
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target = baseToString(target);
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return string.slice(position, position + target.length) == target;
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}
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module.exports = startsWith;
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