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[英]How to properly check if index exists, then use index to get value, then delete index & value from array javascript/jquery
[英]get array value by index jquery
我有一個具有以下值的javascript數組,
let arr = ["2","3","4","5","6"];
我有另一個包含三個整數的數組,
let index = [1,3,4];
我將如何使用JQuery(或Javascript)使用數組從arr獲取索引,並將其添加到新數組。 我想將這些字符串添加到新數組中。
indexArr = ["3","5","6"]
謝謝
簡單,只需使用Array.prototype.map()
:
let arr = ["2","3","4","5","6"]; let index = [1,3,4]; let indexArr = index.map(i => arr[i]); console.log(indexArr);
您可以使用簡單的.map完成
let arr = ["2","3","4","5","6"];
let index = [1,3,4];
index.map(x=>arr[x]) //["3", "5", "6"]
只需使用一個循環。 就個人而言,我更喜歡這種方法而不是map
因為我發現這種方法更容易理解,但這是個人喜好。
let arr = ["2","3","4","5","6"]; let index = [1,3,4]; let indexArr = []; for(var i=0; i<index.length; i++) { indexArr.push(arr[index[i]]); } console.log(indexArr);
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