Javascript Object Remove Key based on Value Keep Object

Question

I have been stuck on this awhile. Found a lot of example on how to remove based on key, but not on value.

I am trying to remove all keys that have value false.

Any help would be appreciated, It seems Object.keys only accesses keys, val seems to have no effect.

const names = {
  1: false,
  2: true,
  3: true,
  5: false
}

const newNames = Object.keys(names).reduce((object, key, val) => {
  console.info('propName', key);
  if (object[val] == true) {
    object[key] = names[key];
  }
  return object;
}, {});
console.info('test', newNames);
// expected output I want should be  {2:true, 3:true}

Any help would be appreciated.

User863 · Accepted Answer · 2020-03-24 04:23:29Z

1

Try checking names[key] is true

const names = {
  1: false,
  2: true,
  3: true,
  5: false
}

const newNames = Object.keys(names).reduce((object, key, val) => {
  if (names[key]) {
    object[key] = names[key];
  }
  return object;
}, {});

console.info('test', newNames);

answered Mar 24, 2020 at 4:23

User863

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Comments

Hank X · Accepted Answer · 2020-03-24 04:28:41Z

1

well if you want to modify the object itself, you event don't need to declare a new object. use delete

const names = {
  1: false,
  2: true,
  3: true,
  5: false
}
for (let k in names){if(!names[k]){delete names[k]}}
console.log(names)

answered Mar 24, 2020 at 4:28

Hank X

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Comments

chakwok · Accepted Answer · 2020-03-24 04:28:43Z

0

const names = {
  1: false,
  2: true,
  3: true,
  5: false
}

for(let name of Object.keys(names)) {
    if(names[name] === false) {
        delete names[name];
    }
}

answered Mar 24, 2020 at 4:28

chakwok

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1 Comment

Suraj Kumar Over a year ago

Please don't post only code as an answer, but also include an explanation of what your code does and how it solves the problem of the question. Answers with an explanation are usually of higher quality and are more likely to attract upvotes.

Pushpendra Kumar · Accepted Answer · 2020-03-24 04:31:54Z

0

Object.keys(names).map(val => {  if(names[val] == false) { delete names[val] } });

answered Mar 24, 2020 at 4:31

Pushpendra Kumar

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1 Comment

Suraj Kumar Over a year ago

Please don't post only code as an answer, but also include an explanation of what your code does and how it solves the problem of the question. Answers with an explanation are usually of higher quality and are more likely to attract upvotes.

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