Replacing keys by values according to some predefined object in javascript

Question

I have an object having key-value pairs. Another array has only a partial set of keys. I want a third array that contains only values and that too only for those keys which are present in the second array.

let x= {'Hello':'Monday', 'World':'Tuesday', 'Program':'Wednesday'}
let y = ['Program','Hello']

What I require in output is : y=['Wednesday', 'Monday']

Is anything stopping you from achieving what you require? Please note that SO is not a get code for free site. We solve problems of our fellow developers... — Rajesh Dixit
– Rajesh Dixit, Commented Oct 17, 2019 at 13:09
Possible duplicate of Dynamically access object property using variable — Rajesh Dixit
– Rajesh Dixit, Commented Oct 17, 2019 at 13:13

Mahesh · Accepted Answer · 2019-10-17 13:04:09Z

2

Try This

let x= {'Hello':'Monday', 'World':'Tuesday', 'Program':'Wednesday'}
let y = ['Program','Hello']

console.log(y.map(val => x[val]));

answered Oct 17, 2019 at 13:04

Mahesh

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3 Comments

Rajesh Dixit Over a year ago

Please add explanation. Just code is incomplete answer

Mahesh Over a year ago

code was quite obvious. So didn't feel a need of explanation. Its just a map function of array.

Rajesh Dixit Over a year ago

If it was that obvious, OP would have not asked. Remember, you are answering for readers and they have all levels. So its always better to explain what and why.

Victor · Accepted Answer · 2019-10-17 13:12:22Z

0

If I understand you correctly, you want to make sure that the result contains only existing values. If so, you need to loop through y values and make sure the x object has a such property.

let x = {'Hello': 'Monday', 'World': 'Tuesday', 'Program': 'Wednesday'},
    y = ['Program', 'Hello', 'Test'],
    z = [];

for (let prop of y) {
  if (prop in x) {
    z.push(x[prop]);
  }
}

console.log(z);

answered Oct 17, 2019 at 13:12

Victor

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