Merge two objects in javascript ignoring undefined values

Question

I have to merge two objects but I don't want to assign undefined value to defined values.

A = { activity: 'purchased', count: undefined, time: '09:05:33' }
B = { activity: 'purchased', count: '51', time: undefined }

When I try Object.assign, undefined is replacing fields that have values.

What I want

C = { activity: 'purchased', count: '51', time: '09:05:33' }

Answer 1

You could use lodash's merge command. C = _.merge(A,B);