1 | import baseIndexOf from './_baseIndexOf.js';
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2 | import isArrayLike from './isArrayLike.js';
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3 | import isString from './isString.js';
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4 | import toInteger from './toInteger.js';
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5 | import values from './values.js';
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6 |
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7 | /* Built-in method references for those with the same name as other `lodash` methods. */
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8 | var nativeMax = Math.max;
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9 |
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10 | /**
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11 | * Checks if `value` is in `collection`. If `collection` is a string, it's
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12 | * checked for a substring of `value`, otherwise
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13 | * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
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14 | * is used for equality comparisons. If `fromIndex` is negative, it's used as
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15 | * the offset from the end of `collection`.
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16 | *
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17 | * @static
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18 | * @memberOf _
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19 | * @since 0.1.0
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20 | * @category Collection
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21 | * @param {Array|Object|string} collection The collection to inspect.
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22 | * @param {*} value The value to search for.
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23 | * @param {number} [fromIndex=0] The index to search from.
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24 | * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
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25 | * @returns {boolean} Returns `true` if `value` is found, else `false`.
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26 | * @example
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27 | *
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28 | * _.includes([1, 2, 3], 1);
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29 | * // => true
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30 | *
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31 | * _.includes([1, 2, 3], 1, 2);
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32 | * // => false
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33 | *
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34 | * _.includes({ 'a': 1, 'b': 2 }, 1);
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35 | * // => true
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36 | *
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37 | * _.includes('abcd', 'bc');
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38 | * // => true
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39 | */
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40 | function includes(collection, value, fromIndex, guard) {
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41 | collection = isArrayLike(collection) ? collection : values(collection);
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42 | fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;
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43 |
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44 | var length = collection.length;
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45 | if (fromIndex < 0) {
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46 | fromIndex = nativeMax(length + fromIndex, 0);
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47 | }
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48 | return isString(collection)
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49 | ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
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50 | : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
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51 | }
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52 |
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53 | export default includes;
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