向JSON数组JavaScript中的每个值添加一个键

Question

I would like to transform the below JSon. The input JSon array can be of any size. I know its a basic question but I can't find the duplicate.

 var input = [{
    "value": 1
 }, {
    "value": 2
 }]

 var output = [{
    "key": {
        "value": 1
    }
 }, {
    "key": {
        "value": 2
    }
 }]

Appreciate all the help.

Answer 1

Create a new array and use Array#forEach to push an object with key = key and a currently iterated object from input as the value.

 var input = [{value:1},{value:2}], result = []; input.forEach(v => result.push({ 'key': v })); console.log(result); 

Answer 2

Try using this, this should solve your problem

output = input.map(value => ({ "key": value }) );
console.log(output);

I used ES6 for simplicity, but this does exactly the same.

Answer 3

I think this will be the most oldschool and hands-on way of doing this.

 var input = [{ "value": 1 }, { "value": 2 }], output = [], newItem, i = 0, ii = input.length; for(i; i<ii; i++){ newItem = {}; newItem.key = {"value":input[i].value}; output.push(newItem); } console.log(output)