[英]How to remove n from an array without mutating it?
嗨,這個問題需要刪除
您可以使用filter
或reduce
,或者先使用slice
復制數組,然后執行splice
。
就個人而言,我喜歡filter
的簡單性和明確的意圖
function removeItem(array, n) { return array.filter((elem, i) => i !== n); } const original = [1,2,3,4]; console.log(removeItem(original, 1)); console.log(original);
function removeItem (array, n) { return array.reduce((result, elem, i) => { if (i !== n) result.push(elem); return result; }, []) } const original = [1,2,3,4]; console.log(removeItem(original, 1)); console.log(original);
function removeItem(array, n) { const result = array.slice(); result.splice(n, 1); return result; } const original = [1,2,3,4]; console.log(removeItem(original, 1)); console.log(original);
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
function removeItem(array, n) {
return array.filter((x, i) => i != n)
}
var array = [2,1,3,5,6,8,9,7]; function removeArray(array,n){ array.splice(array.indexOf(n),1); return array; } console.log(array); array = removeArray(array, 6); console.log(array);
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