object-assign-defined

A tiny, fast and well-tested JavaScript module that works just like Object.assign, but skips assigning undefined values.

Usage

Import the module and use it like this:

import objectAssignDefined from "object-assign-defined";
 
const result = objectAssignDefined({
    "I": 1
}, {
    "LIKE": 2
}, {
    "TRAINS": undefined
});
 
// result is { "I": 1, "LIKE": 2 }

Note that undefined values in source (first argument) won't be vanished:

import objectAssignDefined from "object-assign-defined";
 
const result = objectAssignDefined({
    "I": undefined
}, {
    "LIKE": 2
}, {
    "TRAINS": 3
});
 
// result is { "I": undefined, "LIKE": 2, "TRAINS": 3 }

But you can simply filter undefined values by assigning properties to an empty object, like this:

import objectAssignDefined from "object-assign-defined";
 
const result = objectAssignDefined({}, { "I": undefined });
 
// result is {}

Licence

MIT © Nikita Savchenko