Use Lodash to produce new object from existing object based on array of keys

Question

I am relatively new to Lodash and I'm trying to do something that I'm sure is really easy.

I'm wondering which existing Lodash method to use to take an array of keys and an object, then return a new object containing only the properties (from the original object) that match the keys that were passed in.

let _ = require("lodash");

// DOES THE FUNCTION BELOW ALREADY EXIST?
let only = function (wanted, srcList) {
  return _.reduce(wanted, function(out,key){
    if(_.has(srcList, key)){
      out[key] = srcList[key]
    }
    return out;
  },{})
}


let src = {
  w: "This is doble vuu",
  x: "This is X",
  y: "This is why?",
  z: "This is zeee!"
};

var want = ['x','z'];

let newObject  = only(want,src);

console.log(newObject)

The code I have works, but I don't want to re-invent the proverbial wheel, no matter how simple it is.

The function you want is pick

Gruff Bunny
– Gruff Bunny

2017-11-16 18:41:15 +00:00
Commented Nov 16, 2017 at 18:41 — Gruff Bunny
– Gruff Bunny, Commented Nov 16, 2017 at 18:41

J. Lincoln · Accepted Answer · 2017-11-16 18:56:47Z

2

_.pick works perfectly as suggested by Gruff Bunny in the comments. I don't know why it didn't seem more obvious when I was going through dozens of methods available in Lodash

answered Nov 16, 2017 at 18:56

J. Lincoln

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Comments

GlennHK · Accepted Answer · 2017-11-16 18:37:45Z

0

I believe that you want _.map.

It will return an object with the specified keys if you pass an array of strings as the second argument.

answered Nov 16, 2017 at 18:37

GlennHK

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2 Comments

Sandy Simonton Over a year ago

_.map returns an array, not an object.

GlennHK Over a year ago

true, I got confused with pick

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