filter an object with condition using Underscore.js

Question

I am using Underscore.js library in my application. I have an Object

{a:"1", b:"2", c: "3", d:"no", e: "no"}

I want to condense this object to have only the properties not having "no" attribute which should result in the below object

    {a:"1", b:"2", c: "3"}

In Uderscore.js, I used the below code

_.omit(obj, 'attr');

But in the above code, instead of the 'attr', I need to have a function which will output the keys containing no values. Is there a better way to do this. Please let me know how to get the keys having 'no' values.

the expected output is ` {a:"1", b:"2", c: "3"}`. The object with no "no" values. — zilcuanu
– zilcuanu, Commented Dec 7, 2015 at 13:27
Then use omit with a predicate function: _.omit(obj, function(val) { return val === 'no'}) — marekful
– marekful, Commented Dec 7, 2015 at 13:30

Sami · Accepted Answer · 2015-12-07 13:32:32Z

2

You can use the _.omit as

var obj = {a:"1", b:"2", c: "3", d:"no", e: "no"};
// _.omit returns a copy of the object
obj = _.omit(obj, function(value, key, object) {
  return (value == "no");
});
console.log(obj);

answered Dec 7, 2015 at 13:32

Sami

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Comments

paolobueno · Accepted Answer · 2015-12-07 13:33:01Z

1

Underscore's _.omit() also accepts a 'predicate', which is their terminology for a function similar to _.filter()'s:

var o = {a:"1", b:"2", c: "3", d:"no", e: "no"}
console.log(_.omit(o, function(v){
  return v === 'no';
}));

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>

answered Dec 7, 2015 at 13:33

paolobueno

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