js-wrench/modules/includes.ts

JS函数库

import isArray from './isArray'
import isString from './isString'
import isPrimitive from './isPrimitive';
import isObj from './isObj';
import toKeys from './toKeys';
import has from './has';
import indexOf from './indexOf';

/**
 * @description 判断一个数组里或者字符串是否包含一个指定的值
 *
 * @param {(any[] | string)} data 需要查找的数组或者字符串
 * @param {never} ele 指定的值, 可以是数字,字符串,对象
 * @param {(number | undefined)} [fromIndex] 从指定位置开始查找 可选
 * @return {*}  {boolean} 返回一个布尔值
 * @example includes([1,2,3], 1) => true
 */
const includes = (
	data: any[] | string,
	ele: any,
	fromIndex?: number
): boolean => {
	let index: number = fromIndex || 0
	let i: number = Math.max(
		index >= 0 ? index : data.length - Math.abs(fromIndex as number),
		0
	)
	while (i < data.length) {
		if(isObj(ele)) {
			return indexOf(data, ele, fromIndex) !== -1
		}else {
			if ('' + data[i] === '' + ele) {
				return true
			}
		}
		i++
	}
	return false
}

export default includes