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53 lines
1.7 KiB
53 lines
1.7 KiB
import baseIndexOf from './_baseIndexOf.js'; |
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import isArrayLike from './isArrayLike.js'; |
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import isString from './isString.js'; |
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import toInteger from './toInteger.js'; |
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import values from './values.js'; |
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/* Built-in method references for those with the same name as other `lodash` methods. */ |
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var nativeMax = Math.max; |
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/** |
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* Checks if `value` is in `collection`. If `collection` is a string, it's |
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* checked for a substring of `value`, otherwise |
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* [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero) |
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* is used for equality comparisons. If `fromIndex` is negative, it's used as |
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* the offset from the end of `collection`. |
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* |
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* @static |
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* @memberOf _ |
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* @since 0.1.0 |
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* @category Collection |
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* @param {Array|Object|string} collection The collection to inspect. |
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* @param {*} value The value to search for. |
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* @param {number} [fromIndex=0] The index to search from. |
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* @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`. |
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* @returns {boolean} Returns `true` if `value` is found, else `false`. |
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* @example |
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* |
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* _.includes([1, 2, 3], 1); |
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* // => true |
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* |
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* _.includes([1, 2, 3], 1, 2); |
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* // => false |
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* |
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* _.includes({ 'a': 1, 'b': 2 }, 1); |
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* // => true |
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* |
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* _.includes('abcd', 'bc'); |
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* // => true |
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*/ |
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function includes(collection, value, fromIndex, guard) { |
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collection = isArrayLike(collection) ? collection : values(collection); |
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fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0; |
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var length = collection.length; |
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if (fromIndex < 0) { |
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fromIndex = nativeMax(length + fromIndex, 0); |
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} |
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return isString(collection) |
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? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1) |
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: (!!length && baseIndexOf(collection, value, fromIndex) > -1); |
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} |
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export default includes;
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