[d565449] | 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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