如何从数组中删除一个特定值? 类似 :

array.remove(value);

我必须使用核心核心核心JavaScript。 不允许框架 。


当前回答

Vanilla JavaScript(ES5.1) - (ES5.1) -已经到位版本版本

浏览器支持 :因特网探索者 9或以后(或以后(详细浏览器支持)

/**
 * Removes all occurences of the item from the array.
 *
 * Modifies the array “in place”, i.e. the array passed as an argument
 * is modified as opposed to creating a new array. Also returns the modified
 * array for your convenience.
 */
function removeInPlace(array, item) {
    var foundIndex, fromIndex;

    // Look for the item (the item can have multiple indices)
    fromIndex = array.length - 1;
    foundIndex = array.lastIndexOf(item, fromIndex);

    while (foundIndex !== -1) {
        // Remove the item (in place)
        array.splice(foundIndex, 1);

        // Bookkeeping
        fromIndex = foundIndex - 1;
        foundIndex = array.lastIndexOf(item, fromIndex);
    }

    // Return the modified array
    return array;
}

Vanilla JavaScript(ES5.1) - (ES5.1) -不可变版本版本

浏览器支持: 与原版的香草 JavaScript 相同

/**
 * Removes all occurences of the item from the array.
 *
 * Returns a new array with all the items of the original array except
 * the specified item.
 */
function remove(array, item) {
    var arrayCopy;

    arrayCopy = array.slice();

    return removeInPlace(arrayCopy, item);
}

香草ES6 -不可变版本版本

浏览器支持: Chrome 46, 边缘 12, Firefox 16, Opera 37, Safari 8 ()详细浏览器支持)

/**
 * Removes all occurences of the item from the array.
 *
 * Returns a new array with all the items of the original array except
 * the specified item.
 */
function remove(array, item) {
    // Copy the array
    array = [...array];

    // Look for the item (the item can have multiple indices)
    let fromIndex = array.length - 1;
    let foundIndex = array.lastIndexOf(item, fromIndex);

    while (foundIndex !== -1) {
        // Remove the item by generating a new array without it
        array = [
            ...array.slice(0, foundIndex),
            ...array.slice(foundIndex + 1),
        ];

        // Bookkeeping
        fromIndex = foundIndex - 1;
        foundIndex = array.lastIndexOf(item, fromIndex)
    }

    // Return the new array
    return array;
}

其他回答

const arr = [1, 2, 3, 4, 5]
console.log(arr) // [ 1, 2, 3, 4, 5 ]

假设你想从Arr删除3号

const newArr = arr.filter(w => w !==3)
console.log(newArr) // [ 1, 2, 4, 5 ]
 (function removeFromArrayPolyfill() {
      if (window.Array.prototype.remove) return;
    
      Array.prototype.remove = function (value) {
        if (!this.length || !value) return;
    
        const indexOfValue = this.indexOf(value);
    
        if (indexOfValue >= 0) {
          this.splice(indexOfValue, 1);
        }
      };
    })();
    
    // testing polyfill
    const nums = [10, 20, 30];
    nums.remove(20);
    console.log(nums);//[10,30]

业绩 业绩业绩 业绩业绩

今天(2019-12-09),我为选择的解决方案对macOS v10.13.6(高塞拉利昂)进行性能测试。delete(A),但与其他方法相比,我并不使用它,因为它在数组中留下了空白。

结 结 结 结 结 结 结

  • 最快的解决方案是array.splice(C) (小型阵列有第二次的Safeare除外)
  • 以大数组盟誓,array.slice+splice(H) 是Firefox和Safari最快、不可改变的解决办法;Array.from(B) 铬含量最快
  • 可变溶液通常比不可变的更快1.5x-6x
  • 令人惊讶的是,变异解决办法(C)慢于不可变解决办法(G)

详细细节

在测试中,我以不同的方式从数组中删除中间元素。A、C本地的解决方案。B、D、E、F、G、H解决方案是不可改变的。

包含 10 元素的阵列结果

Enter image description here

在铬array.splice(C) 是当地最快的解决办法。array.filter(D) 是最快、不可改变的解决方案。array.slice(F). 您可以在机器上进行测试在这里.

带有 1 000 000 元素的阵列结果

Enter image description here

在铬array.splice(C) 是最迅速的就地解决办法delete(C) 的快速性相似,但它在数组中留下了一个空位(因此它不执行“完全移除”)。array.slice-splice(H) 是最快的不可改变的解决方案。 最慢的是array.filter(D和E). 您可以在您的机器上进行测试。在这里.

var a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
var log = (letter,array) => console.log(letter, array.join `,`);

function A(array) {
  var index = array.indexOf(5);
  delete array[index];
  log('A', array);
}

function B(array) {
  var index = array.indexOf(5);
  var arr = Array.from(array);
  arr.splice(index, 1)
  log('B', arr);
}

function C(array) {
  var index = array.indexOf(5);
  array.splice(index, 1);
  log('C', array);
}

function D(array) {
  var arr = array.filter(item => item !== 5)
  log('D', arr);
}

function E(array) {
  var index = array.indexOf(5);
  var arr = array.filter((item, i) => i !== index)
  log('E', arr);
}

function F(array) {
  var index = array.indexOf(5);
  var arr = array.slice(0, index).concat(array.slice(index + 1))
  log('F', arr);
}

function G(array) {
  var index = array.indexOf(5);
  var arr = [...array.slice(0, index), ...array.slice(index + 1)]
  log('G', arr);
}

function H(array) {
  var index = array.indexOf(5);
  var arr = array.slice(0);
  arr.splice(index, 1);
  log('H', arr);
}

A([...a]);
B([...a]);
C([...a]);
D([...a]);
E([...a]);
F([...a]);
G([...a]);
H([...a]);
This snippet only presents code used in performance tests - it does not perform tests itself.

浏览器比较:Chrome v78.0.0,Safari v.13.0.4和Firefox v71.0.0

Enter image description here

Vanilla JavaScript(ES5.1) - (ES5.1) -已经到位版本版本

浏览器支持 :因特网探索者 9或以后(或以后(详细浏览器支持)

/**
 * Removes all occurences of the item from the array.
 *
 * Modifies the array “in place”, i.e. the array passed as an argument
 * is modified as opposed to creating a new array. Also returns the modified
 * array for your convenience.
 */
function removeInPlace(array, item) {
    var foundIndex, fromIndex;

    // Look for the item (the item can have multiple indices)
    fromIndex = array.length - 1;
    foundIndex = array.lastIndexOf(item, fromIndex);

    while (foundIndex !== -1) {
        // Remove the item (in place)
        array.splice(foundIndex, 1);

        // Bookkeeping
        fromIndex = foundIndex - 1;
        foundIndex = array.lastIndexOf(item, fromIndex);
    }

    // Return the modified array
    return array;
}

Vanilla JavaScript(ES5.1) - (ES5.1) -不可变版本版本

浏览器支持: 与原版的香草 JavaScript 相同

/**
 * Removes all occurences of the item from the array.
 *
 * Returns a new array with all the items of the original array except
 * the specified item.
 */
function remove(array, item) {
    var arrayCopy;

    arrayCopy = array.slice();

    return removeInPlace(arrayCopy, item);
}

香草ES6 -不可变版本版本

浏览器支持: Chrome 46, 边缘 12, Firefox 16, Opera 37, Safari 8 ()详细浏览器支持)

/**
 * Removes all occurences of the item from the array.
 *
 * Returns a new array with all the items of the original array except
 * the specified item.
 */
function remove(array, item) {
    // Copy the array
    array = [...array];

    // Look for the item (the item can have multiple indices)
    let fromIndex = array.length - 1;
    let foundIndex = array.lastIndexOf(item, fromIndex);

    while (foundIndex !== -1) {
        // Remove the item by generating a new array without it
        array = [
            ...array.slice(0, foundIndex),
            ...array.slice(foundIndex + 1),
        ];

        // Bookkeeping
        fromIndex = foundIndex - 1;
        foundIndex = array.lastIndexOf(item, fromIndex)
    }

    // Return the new array
    return array;
}

最干净的:

var arr = ['1','2','3'];
arr = arr.filter(e => e !== '3');
console.warn(arr);

这也将删除重复(如果有的话)。