Loop through JSON object and generate array based on key name

Question

I have the following json object:

[{"i_value":"1","i_value_2":"1"},
{"i_value":"24","i_value_2":"24"}]

Then I have the following loop:

let setData = [];
for (let i = 0; i < response.data.length; i++) {
    if ('access key name' === 'i_value') {
        setData.push(response.data[i].i_value)
    }
}
setData = setData.map(Number);
console.log(setData);

I only want to populate the new setData array when the key name === i_value not i_value_2

I tried the following:

let setData = [];
let keys = Object.keys(response.data);
for (let i = 0; i < response.data.length; i++) {
    if (keys[i] === 'i_value') {
        setData.push(response.data[i].i_value)
    }
}
setData = setData.map(Number);
console.log(setData);

But this doesn't work. Any thoughts on this?

CertainPerformance · Accepted Answer · 2018-10-04 06:30:16Z

5

Just take the original data and .map, extracting the i_value property:

const input = [{"i_value":"1","i_value_2":"1"},
{"i_value":"24","i_value_2":"24"}];

console.log(
  input.map(({ i_value }) => Number(i_value))
);

Also note that there's no such thing as a JSON object. If you have an object, you just have an object; JSON format is a format for strings that can be transformed into objects via JSON.parse.

answered Oct 4, 2018 at 6:30

CertainPerformance

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1 Comment

dexter Over a year ago

Helpfull! And thanks for pointing out my misunderstanding about JSON object :-).

Mamun · Accepted Answer · 2018-10-04 06:35:59Z

2

You can use map() to create a new array with the results of calling a provided function on every element in the calling array in the following way:

var response = {}
response.data = [{"i_value":"1","i_value_2":"1"},
{"i_value":"24","i_value_2":"24"}]

let setData = response.data.map(o => Number(o.i_value));

console.log(setData);

answered Oct 4, 2018 at 6:35

Mamun

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2 Comments

dexter Over a year ago

And this actually saves me from doing the loop! Many thanks for this!

Mamun Over a year ago

@dexter, you are most welcome. And yes, these are the the beauty of array functions......

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