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

 (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]

其他回答

很简单,只要做:

var arr = [1,2,4,5];
arr.splice(arr.indexOf(5), 1);
console.log(arr); // [1,2,4];

我还有一个从阵列中移除的好办法:

var words = ['spray', 'limit', 'elite', 'exuberant', 'destruction', 'present'];

const result = words.filter(word => word.length > 6);

console.log(result);
// expected output: Array ["exuberant", "destruction", "present"]

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

删除上次发生或所有发生, 还是第一次发生 ?

var array = [2, 5, 9, 5];

// Remove last occurrence (or all occurrences)
for (var i = array.length; i--;) {
  if (array[i] === 5) {
     array.splice(i, 1);
     break; // Remove this line to remove all occurrences
  }
}

var array = [2, 5, 9, 5];

// Remove first occurrence
for (var i = 0; array.length; i++) {
  if (array[i] === 5) {
     array.splice(i, 1);
     break; // Do not remove this line
  }
}

删除单个元素

function removeSingle(array, element) {
    const index = array.indexOf(element)
    if (index >= 0) {
        array.splice(index, 1)
    }
}

删除多个元素, 位置内

这对于确保算法在O(N)时间运行更为复杂。

function removeAll(array, element) {
    let newLength = 0
    for (const elem of array) {
        if (elem !== number) {
            array[newLength++] = elem
        }
    }
    array.length = newLength
}

删除多个元素,创建新对象

array.filter(elem => elem !== number)

Array.prototype.removeByValue = function (val) {
  for (var i = 0; i < this.length; i++) {
    if (this[i] === val) {
      this.splice(i, 1);
      i--;
    }
  }
  return this;
}

var fruits = ['apple', 'banana', 'carrot', 'orange'];
fruits.removeByValue('banana');

console.log(fruits);
// -> ['apple', 'carrot', 'orange']