Reduce over Javascript Object values

Question

Is there a way to write a reduce function over Object values in Javascript? I'm looking for the analog of reducing over an array of keys:

Object.keys(hash).reduce(function(a, b) {

// reduce logic 

})

Bergi · Accepted Answer · 2014-02-11 14:38:37Z

1

No, there are no such native higher-order functions for objects.

You either will have to write your own, use a library (Underscore's _.reduce does work on objects as well) or apply the Array method on the keys like you just have:

 Object.keys(hash).reduce(function(sum, k) {
     return sum + hash[k];
 }, 0)

answered Feb 11, 2014 at 14:38

Bergi

671k162 gold badges1k silver badges1.5k bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Johan · Accepted Answer · 2014-02-11 14:38:21Z

0

Is this what you need?

var o = { a:1, b:2, c:3 },
    values = [];

for(var k in o) {
    values.push(o[k]);
}

var result = values.reduce(function(previousValue, currentValue, index, array){
  return previousValue + currentValue;
});

console.log(result);

http://jsfiddle.net/Mkm6e/

answered Feb 11, 2014 at 14:38

Johan

35.4k62 gold badges191 silver badges309 bronze badges

Collectives™ on Stack Overflow

Reduce over Javascript Object values

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related