Node.js: Async callback in _.chain underscore

Question

The arr.length is still undefined after I call _.chain() underscore operation:

var arr = _.chain(msg)
   .groupBy(function(item) {return item.ts_simple; })
   .value();

console.log(arr.length); //undefined
console.log(arr); //correct object array

The first console.log(arr.length) for underscore var array length is undefined while the console.log(arr) outputs the correct returned object array.

How do I callback after underscore operation is complete?

SLaks · Accepted Answer · 2016-02-17 21:04:10Z

3

groupBy() returns an object, not an array.

It has no length property.

answered Feb 17, 2016 at 21:04

SLaks

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