JavaScript Using the spread operator with nested objects
JavaScript Using the spread operator with nested objects DEV Community Monica Gerard Posted on Feb 14 2022 JavaScript Using the spread operator with nested objects javascript programming tutorial beginners Wouldn t it be nice if copying objects were as simple as reassigning them to new objects
How to use spread operator on nested javascript objects , Usually when updating a javascript object immutably I would use the spread operator then define any changes afterwards as follows state state property1 newvalue However im unsure how to use the spread operator when i have nested objects Here is the relevant code and my attempt
How to update a deeply nested object in Javascript
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Javascript How to use object spread with nested properties Stack , 3 Answers Sorted by 114 Error you are getting because of the this key loginForm email It s not a valid object key Write it like this return state loginForm state loginForm email action payload email Share Improve this answer Follow answered Nov 3 2017 at 19 21 Mayank Shukla 102k 19 159 142 1
Update Multiple Properties of an object with spread operator
Update Multiple Properties of an object with spread operator, 15 I have a state in a reducer that looks like this The current source selection const selection timespan 3660 customTimespan false pathIds source undefined direction 0 appClassIds What I want now is to update multiple properties timespan and customTimeSpan something like this but this doesn t work
React SetState Update Nested Object
Spread syntax JavaScript MDN MDN Web Docs
Spread syntax JavaScript MDN MDN Web Docs There are three distinct places that accept the spread syntax Function arguments list myFunction a iterableObj b Array literals 1 iterableObj 4 five 6 Object literals obj key value Although the syntax looks the same they come with slightly different semantics
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The spread syntax in your function isn t necessary you already create a new object with results and keyname creates a keyname property not one with a dynamic name same problem in using object key instead of object key you might want to revisit dot vs bracket notation But the main problem is that your updateObject function doesn t update the object it was passed rather it returns Javascript Function to update any value by key in nested object . Spreading your objects is an easy operation It works in a similar fashion to common arrays In this case instead of spreading array items you will spread key value pairs You can spread such data into other objects in order to modify and shape them to your pleasure Spreading key value pairs into objects Cloning Arrays Objects With Nested Elements In the first part of this article we learned about reference data types accidental variable mutation and how we could solve this problem by cloning arrays objects immutably with the spread operator However there s a slight problem with this approach when it comes to nested reference data types
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