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 。
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
更现代一点ECMAScript 2015(原称和谐或ES6)方法。
const items = [1, 2, 3, 4];
const index = 2;
然后:
items.filter((x, i) => i !== index);
弹出 :
[1, 2, 4]
其他回答
const newArray = oldArray.filter(item => item !== removeItem);
使用数组过滤过滤器方法 :
let array = [1, 2, 3, 4, 511, 34, 511, 78, 88];
let value = 511;
array = array.filter(element => element !== value);
console.log(array)
const Delete = (id) => {
console.log(id)
var index = Array.map(function(e){
return e.id;
}).indexOf(id);
Array.splice(index,1);
}
除了所有这些解决方案之外, 它也可以用阵列来完成. 减量...
const removeItem =
idx =>
arr =>
arr.reduce((acc, a, i) => idx === i ? acc : acc.concat(a), [])
const array = [1, 2, 3]
const index = 1
const newArray = removeItem(index)(array)
console.log(newArray) // logs the following array to the console : [1, 3]
...或者一个循环函数(诚实地说不是那么优雅...也许有人有更好的循环解决方案? ? )...
const removeItemPrep =
acc =>
i =>
idx =>
arr =>
// If the index equals i, just feed in the unchanged accumulator(acc) else...
i === idx ? removeItemPrep(acc)(i + 1)(idx)(arr) :
// If the array length + 1 of the accumulator is smaller than the array length of the original array concatenate the array element at index i else...
acc.length + 1 < arr.length ? removeItemPrep(acc.concat(arr[i]))(i + 1)(idx)(arr) :
// return the accumulator
acc
const removeItem = removeItemPrep([])(0)
const array = [1, 2, 3]
const index = 1
const newArray = removeItem(index)(array)
console.log(newArray) // logs the following array to the console : [1, 3]
let removeAnElement = (arr, element)=>{
let findIndex = -1;
for (let i = 0; i<(arr.length); i++){
if(arr[i] === element){
findIndex = i;
break;
}
}
if(findIndex == -1){
return arr;
}
for (let i = findIndex; i<(arr.length-1); i++){
arr[i] = arr[i+1];
}
arr.length -= 1;
return arr;
}
let array = ['apple', 'ball', 'cat', 'dog', 'egg'];
let removeElement = 'ball';
let tempArr2 = removeAnElement(array, 'dummy');
console.log(tempArr2);
// ['apple', 'cat', 'dog', 'egg']
let tempArr = removeAnElement(array, removeElement);
console.log(tempArr);`enter code here`
// ['apple', 'cat', 'dog', 'egg']