I have a javascript object like {"1":true,"2":false,"3":true}
I want to create a javascript array like [1,3] by taking the keys whose value is true.
How can I do that?
-
2@VipinKumar, reopened even before posting your comment. And this not exact duplicate but OP could have used that answer to find his solution.Satpal– Satpal2017-12-07 11:14:44 +00:00Commented Dec 7, 2017 at 11:14
-
Totally agree with you. I too figured that out. Once i submitted the comment, duplicate was removed.Vipin Kumar– Vipin Kumar2017-12-07 11:17:32 +00:00Commented Dec 7, 2017 at 11:17
-
@VipinKumar, Once i submitted the comment, duplicate was removed. then you too could have removed the commentSatpal– Satpal2017-12-07 11:32:29 +00:00Commented Dec 7, 2017 at 11:32
Add a comment
|
4 Answers
Use Object#keys with array#filter to return those key whose value is true.
var obj = {"1":true,"2":false,"3":true};
var result = Object.keys(obj).filter(k => obj[k]).map(Number);
console.log(result);
Comments
You can do that Out of the box from ES5 using Object.keys(yourobject) and using the filter on top of it
var obj = { 0: 'a', 1: 'b', 2: 'c' };
console.log(Object.keys(obj)); // console: ['0', '1', '2']
Comments
Please find the solution below. First you need to filter and then map to Numbers.
var obj = {
"1": true,
"2": false,
"3": true
}
var keys = Object.keys(obj).filter(key => obj[key]).map(key => Number(key))
console.log(keys);
Comments
const o = {
"1": true,
"2": false,
"3": true
};
const result = Object.entries(o).reduce((p, [k, v]) => v ? [...p, +k] : p, []);
console.log(result);