I have a structure like the following:
skillet.person = { name: { first: '', last: '' }, age: { current: '' }, birthday: { day: '', month: '', year: '' } } I was wondering how I would update these values ? i.e. I thought the following was correct
skillet.person.name.push({ first: 'blah', last: 'ha'}); but it's wrong? How can I fix this?
Using ES7+ syntax and a functional approach:
const new_obj = { ...obj, name: { first: 'blah', last: 'ha'} } 
const new_obj = { ...obj, name: { first: 'blah'} }? I missed the last property!
last property. If you want to update just the first property (without deleting the last property), you should do const new_obj = { ...obj, name: { ...obj.name, first: 'blah'} }.
...obj supposed to be replaced with skillet.person in this example? Or ...skillet.person?
...obj is equivalent to ...skillet.person hereOn recent browsers with ECMAScript 2015, you can do:
Object.assign(skillet.person.name, { first: 'blah', last: 'ha'}); which will preserve any existing attribute not listed in the right object.
Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
[EDIT] With ES7, you can do even shorter, but it recreates the object (unlike Object.assign) and then adds some overhead if you care about performance. (comment thanks to Jamie Marshall)
{...skillet.person.name, ...{ first: 'blah', last: 'ha'}}; Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax
As @ramon-diogo wrote with ES7+
I like to update nested values like:
let user = { name: { first: 'john', last: 'smith' }, age: 18, city: 'new york' } const age = 20; user = {...user, age} console.log(user.age) // output: 20 const newData ={ age: 22, city: 'san francisco' }; user = {...user,...newData} console.log(user.name.first) // output: john console.log(user.age) // output: 22 console.log(user.city) // output: 'san francisco' 
skillet.person.name.first = "blah" skillet.person.name.last = "ha" or
skillet.person.name = {first : "blah", last : "ha"} 
extend function. See Underscore.js for an implementation.{ ... } but it will replace the 3 unfilled vals - so it means i must write 6 properties like skillet.person.name.first etc ?If you want to mix an object into another one, you can use jQuery's deep extend function. "Deep" means that it does not overwrite name with the new object, but rather overwrites the properties inside such an object.
$.extend(true, skillet.person, { name: { first: 'updated' }, birthday: { day: 'updated', year: 'updated' } }); Now, skillet.person has the appropriate properties updated, while the other properties are untouched.
push is a method of Arrays that adds a new item to an array.
If you want to replace the value then:
skillet.person.name = { … }; If you want to store multiple (full) names in the object, then you'll need the property to hold an array of objects instead of a single object.
for(var prop in newValues) { oldValues[prop] = newValues[prop];} (in a gist). MDN also has a good page about for...in. Have a look at it.I think that is simpler
let skillet = { person: { name : { first: '', last : '' }, age : { current: '' }, birthday: { day : '', month: '', year : '' } } }; let update = { person: { name: { first: 'blah', last : 'ha' } } }; let result = Object.assign(skillet.person, update.person); console.log(result); 
skillet.person.name.first = "blah" skillet.person.name.last = "ha" The easiest way.
Easist and simple way to update the javascipt object properties
const skillet = [ person = { name: { first: 'Arbaz', last: 'khan' }, age: { current: 'ten' }, birthday: { day: '', month: '', year: '' } } ] suppose we want to update the first name. This is how we will do this in ES7+
skilled.map(person => {...person,person.name.first:"Arbaz2"}) The above code will update all the objects. On the other hand if you want to update only particular object. We can do this as well we just need one condition here. But in that case you need unique field as well let call it personId.
skillled.map(person => person.personId === personId ? {...person,person.name.first:"Arbaz2"} : person); 
skillset.person.name = {}; This is the easiest way to assign value to the property of an object.
