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Filename : includes.js
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import baseIndexOf from './_baseIndexOf.js';
import isArrayLike from './isArrayLike.js';
import isString from './isString.js';
import toInteger from './toInteger.js';
import values from './values.js';

/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeMax = Math.max;

/**
 * Checks if `value` is in `collection`. If `collection` is a string, it's
 * checked for a substring of `value`, otherwise
 * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
 * is used for equality comparisons. If `fromIndex` is negative, it's used as
 * the offset from the end of `collection`.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Collection
 * @param {Array|Object|string} collection The collection to inspect.
 * @param {*} value The value to search for.
 * @param {number} [fromIndex=0] The index to search from.
 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
 * @returns {boolean} Returns `true` if `value` is found, else `false`.
 * @example
 *
 * _.includes([1, 2, 3], 1);
 * // => true
 *
 * _.includes([1, 2, 3], 1, 2);
 * // => false
 *
 * _.includes({ 'a': 1, 'b': 2 }, 1);
 * // => true
 *
 * _.includes('abcd', 'bc');
 * // => true
 */
function includes(collection, value, fromIndex, guard) {
  collection = isArrayLike(collection) ? collection : values(collection);
  fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;

  var length = collection.length;
  if (fromIndex < 0) {
    fromIndex = nativeMax(length + fromIndex, 0);
  }
  return isString(collection)
    ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
    : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
}

export default includes;