var toString = require('./toString');
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/** Used to generate unique IDs. */
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var idCounter = 0;
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/**
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* Generates a unique ID. If `prefix` is given, the ID is appended to it.
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*
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* @static
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* @since 0.1.0
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* @memberOf _
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* @category Util
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* @param {string} [prefix=''] The value to prefix the ID with.
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* @returns {string} Returns the unique ID.
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* @example
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*
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* _.uniqueId('contact_');
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* // => 'contact_104'
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*
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* _.uniqueId();
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* // => '105'
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*/
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function uniqueId(prefix) {
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var id = ++idCounter;
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return toString(prefix) + id;
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}
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module.exports = uniqueId;
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