用javascript实现数组交叉的最简单、无库代码是什么?我想写

intersection([1,2,3], [2,3,4,5])

并获得

[2, 3]

当前回答

对于只包含字符串或数字的数组,你可以做一些排序,就像其他答案一样。对于任意对象数组的一般情况,我不认为你可以避免这样做。下面将为您提供任意数量的数组的交集作为arrayIntersection的参数:

var arrayContains = Array.prototype.indexOf ?
    function(arr, val) {
        return arr.indexOf(val) > -1;
    } :
    function(arr, val) {
        var i = arr.length;
        while (i--) {
            if (arr[i] === val) {
                return true;
            }
        }
        return false;
    };

function arrayIntersection() {
    var val, arrayCount, firstArray, i, j, intersection = [], missing;
    var arrays = Array.prototype.slice.call(arguments); // Convert arguments into a real array

    // Search for common values
    firstArray = arrays.pop();
    if (firstArray) {
        j = firstArray.length;
        arrayCount = arrays.length;
        while (j--) {
            val = firstArray[j];
            missing = false;

            // Check val is present in each remaining array 
            i = arrayCount;
            while (!missing && i--) {
                if ( !arrayContains(arrays[i], val) ) {
                    missing = true;
                }
            }
            if (!missing) {
                intersection.push(val);
            }
        }
    }
    return intersection;
}

arrayIntersection( [1, 2, 3, "a"], [1, "a", 2], ["a", 1] ); // Gives [1, "a"]; 

其他回答

这是我使用的一个非常简单的实现。它是无损的,也确保不复制整个。

Array.prototype.contains = function(elem) {
    return(this.indexOf(elem) > -1);
};

Array.prototype.intersect = function( array ) {
    // this is naive--could use some optimization
    var result = [];
    for ( var i = 0; i < this.length; i++ ) {
        if ( array.contains(this[i]) && !result.contains(this[i]) )
            result.push( this[i] );
    }
    return result;
}

这是一个现代和简单的ES6方式来做,也非常灵活。 它允许您指定多个数组作为与主题数组进行比较的数组,并且可以在包含和独占模式下工作。

// =======================================
// The function
// =======================================

function assoc(subjectArray, otherArrays, { mustBeInAll = true } = {}) {
  return subjectArray.filter((subjectItem) => {
    if (mustBeInAll) {
      return otherArrays.every((otherArray) =>
        otherArray.includes(subjectItem)
      );
    } else {
      return otherArrays.some((otherArray) => otherArray.includes(subjectItem));
    }
  });
}

// =======================================
// The usage
// =======================================

const cheeseList = ["stilton", "edam", "cheddar", "brie"];
const foodListCollection = [
  ["cakes", "ham", "stilton"],
  ["juice", "wine", "brie", "bread", "stilton"]
];

// Output will be: ['stilton', 'brie']
const inclusive = assoc(cheeseList, foodListCollection, { mustBeInAll: false }),

// Output will be: ['stilton']
const exclusive = assoc(cheeseList, foodListCollection, { mustBeInAll: true })

实例:https://codesandbox.io/s/zealous-butterfly-h7dgf?fontsize=14&hidenavigation=1&theme=dark

对于只包含字符串或数字的数组,你可以做一些排序,就像其他答案一样。对于任意对象数组的一般情况,我不认为你可以避免这样做。下面将为您提供任意数量的数组的交集作为arrayIntersection的参数:

var arrayContains = Array.prototype.indexOf ?
    function(arr, val) {
        return arr.indexOf(val) > -1;
    } :
    function(arr, val) {
        var i = arr.length;
        while (i--) {
            if (arr[i] === val) {
                return true;
            }
        }
        return false;
    };

function arrayIntersection() {
    var val, arrayCount, firstArray, i, j, intersection = [], missing;
    var arrays = Array.prototype.slice.call(arguments); // Convert arguments into a real array

    // Search for common values
    firstArray = arrays.pop();
    if (firstArray) {
        j = firstArray.length;
        arrayCount = arrays.length;
        while (j--) {
            val = firstArray[j];
            missing = false;

            // Check val is present in each remaining array 
            i = arrayCount;
            while (!missing && i--) {
                if ( !arrayContains(arrays[i], val) ) {
                    missing = true;
                }
            }
            if (!missing) {
                intersection.push(val);
            }
        }
    }
    return intersection;
}

arrayIntersection( [1, 2, 3, "a"], [1, "a", 2], ["a", 1] ); // Gives [1, "a"]; 

通过对数据的一些限制,您可以在线性时间内完成!

对于正整数:使用一个数组将值映射到“已见/未见”布尔值。

function intersectIntegers(array1,array2) { 
   var seen=[],
       result=[];
   for (var i = 0; i < array1.length; i++) {
     seen[array1[i]] = true;
   }
   for (var i = 0; i < array2.length; i++) {
     if ( seen[array2[i]])
        result.push(array2[i]);
   }
   return result;
}

对于对象也有类似的技术:取一个虚拟键,为array1中的每个元素设置为“true”,然后在array2的元素中寻找这个键。完事后收拾一下。

function intersectObjects(array1,array2) { 
   var result=[];
   var key="tmpKey_intersect"
   for (var i = 0; i < array1.length; i++) {
     array1[i][key] = true;
   }
   for (var i = 0; i < array2.length; i++) {
     if (array2[i][key])
        result.push(array2[i]);
   }
   for (var i = 0; i < array1.length; i++) {
     delete array1[i][key];
   }
   return result;
}

当然,你需要确保这个键之前没有出现过,否则你会破坏你的数据…

下面是一个使用可选的比较函数处理多个数组的简单实现:

函数交叉(数组,compareFn = (val1, val2) => (val1 == val2)) { 如果数组。长度< 2)返回数组[0]?[] Const array1 = arrays[0] const array2 =交集(arrays.slice(1), compareFn) array1返回。过滤器(val1 =>数组2。if (val2 => compareFn(val1, val2))) } console.log(十字路口([[1,2,3],[2、3、4、5]])) console.log(十字路口([[{id: 1}, {id: 2}], [{id: 1}, {id: 3}]], (val1, val2) => val1。Id === val2.id)