我有一个目标数组[“apple”、“banana”、“orange”],我想检查其他数组是否包含任何一个目标阵列元素。
例如:
["apple","grape"] //returns true;
["apple","banana","pineapple"] //returns true;
["grape", "pineapple"] //returns false;
如何在JavaScript中实现?
我有一个目标数组[“apple”、“banana”、“orange”],我想检查其他数组是否包含任何一个目标阵列元素。
例如:
["apple","grape"] //returns true;
["apple","banana","pineapple"] //returns true;
["grape", "pineapple"] //returns false;
如何在JavaScript中实现?
当前回答
使用筛选器/indexOf:
函数containsAny(源,目标){var result=source.filter(函数(项){return target.indexOf(项)>-1});返回(result.length>0);} //结果var fruits=[“苹果”、“香蕉”、“橙色”];console.log(包含任何(水果,[“苹果”,“葡萄”]);console.log(包含任何(水果,[“苹果”,“香蕉”,“菠萝”]);console.log(包含任何(水果,[“葡萄”,“菠萝”]);
其他回答
良好的性能解决方案:
我们应该将其中一个数组转换为对象。
const contains = (arr1, mainObj) => arr1.some(el => el in mainObj);
const includes = (arr1, mainObj) => arr1.every(el => el in mainObj);
用法:
const mainList = ["apple", "banana", "orange"];
// We make object from array, you can use your solution to make it
const main = Object.fromEntries(mainList.map(key => [key, true]));
contains(["apple","grape"], main) // => true
contains(["apple","banana","pineapple"], main) // => true
contains(["grape", "pineapple"], main) // => false
includes(["apple", "grape"], main) // => false
includes(["banana", "apple"], main) // => true
您可能会面临由in运算符检查的一些缺点(例如{}//=>true中的“toString”),因此您可以将解决方案更改为obj[key]检查器
你可以这样做
let filteredArray = array.filter((elm) => {
for (let i=0; i<anotherAray.length; i++) {
return elm.includes(anotherArray[i])
}
})
var target = ["apple","banana","orange"];
var checkArray = ["apple","banana","pineapple"];
var containsOneCommonItem = target.some(x => checkArray.some(y => y === x));`
["apple","grape"] //returns true;
["apple","banana","pineapple"] //returns true;
["grape", "pineapple"] //returns false;
不确定这在性能方面可能有多高效,但这就是我使用数组解构来保持一切美好和简短的原因:
const shareElements = (arr1, arr2) => {
const typeArr = [...arr1, ...arr2]
const typeSet = new Set(typeArr)
return typeArr.length > typeSet.size
}
由于集合不能有重复的元素,而数组可以,因此组合两个输入数组,将其转换为集合,并比较集合大小和数组长度将告诉您它们是否共享任何元素。
ES6(最快)
const a = ['a', 'b', 'c'];
const b = ['c', 'a', 'd'];
a.some(v=> b.indexOf(v) !== -1)
2016年
const a = ['a', 'b', 'c'];
const b = ['c', 'a', 'd'];
a.some(v => b.includes(v));
强调
const a = ['a', 'b', 'c'];
const b = ['c', 'a', 'd'];
_.intersection(a, b)
演示:https://jsfiddle.net/r257wuv5/
jsPerf(性能):https://jsperf.com/array-contains-any-element-of-another-array