1 | import toString from './toString';
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2 |
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3 | /** Used to generate unique IDs. */
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4 | var idCounter = 0;
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5 |
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6 | /**
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7 | * Generates a unique ID. If `prefix` is given, the ID is appended to it.
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8 | *
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9 | * @static
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10 | * @since 0.1.0
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11 | * @memberOf _
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12 | * @category Util
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13 | * @param {string} [prefix=''] The value to prefix the ID with.
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14 | * @returns {string} Returns the unique ID.
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15 | * @example
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16 | *
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17 | * _.uniqueId('contact_');
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18 | * // => 'contact_104'
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19 | *
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20 | * _.uniqueId();
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21 | * // => '105'
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22 | */
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23 | function uniqueId(prefix) {
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24 | var id = ++idCounter;
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25 | return toString(prefix) + id;
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26 | }
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27 |
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28 | export default uniqueId;
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