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
嵌套调用.find()的Array.filter()将返回第一个数组中属于第二个数组的所有元素。检查返回数组的长度,以确定第一个数组中是否有第二个数组。
getCommonItems(firstArray, secondArray) {
return firstArray.filter((firstArrayItem) => {
return secondArray.find((secondArrayItem) => {
return firstArrayItem === secondArrayItem;
});
});
}
其他回答
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”]);
您正在寻找两个数组之间的交集。你有两种主要的交叉点类型:“每个”和“一些”。让我举几个好例子:
每
let brands1 = ['Ford', 'Kia', 'VW', 'Audi'];
let brands2 = ['Audi', 'Kia'];
// Find 'every' brand intersection.
// Meaning all elements inside 'brands2' must be present in 'brands1':
let intersectionEvery = brands2.every( brand => brands1.includes(brand) );
if (intersectionEvery) {
const differenceList = brands1.filter(brand => !brands2.includes(brand));
console.log('difference list:', differenceList);
const commonList = brands1.filter(brand => brands2.includes(brand));
console.log('common list:', commonList);
}
如果条件不满足(比如你在品牌中加入了“梅赛德斯”),那么“intersectionEvery”就不满足了——这将是错误的。
如果满足条件,它将把[“福特”、“大众”]列为区别,把[“起亚”、“奥迪”]列为了常见列表。
沙盒:https://jsfiddle.net/bqmg14t6/
SOME
let brands1 = ['Ford', 'Kia', 'VW', 'Audi'];
let brands2 = ['Audi', 'Kia', 'Mercedes', 'Land Rover'];
// Find 'some' brand intersection.
// Meaning some elements inside 'brands2' must be also present in 'brands1':
let intersectionSome = brands2.some( brand => brands1.includes(brand) );
if (intersectionSome) {
const differenceList = brands1.filter(brand => !brands2.includes(brand));
console.log('difference list:', differenceList);
const commonList = brands1.filter(brand => brands2.includes(brand));
console.log('common list:', commonList);
}
我们在这里寻找一些常见的品牌,但不一定全部。
它将把[“福特”、“大众”]列为不同品牌,把[“起亚”、“奥迪”]列为了共同品牌。
沙盒:https://jsfiddle.net/zkq9j3Lh/
更新@Paul Grimshaw答案,使用includes代替indexOf以提高可读性
let found=arr1.some(r=>arr2.indexOf(r)>=0)let found=arr1.some(r=>arr2.includes(r))
ES6溶液:
let arr1 = [1, 2, 3];
let arr2 = [2, 3];
let isFounded = arr1.some( ai => arr2.includes(ai) );
与之不同:必须包含所有值。
let allFounded = arr2.every( ai => arr1.includes(ai) );
希望,会有所帮助。
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