'Why is Redux State Immutable?' by supertokensio opensource redux
If the value of two variables are the same, their reference may or may not be the same.If the reference of two variables is the same, their values must be the same.Re-Rendering of React Components
Coming back to redux and react, react will only want to re-render a component if the value of the props or state has changed. To know if a value of these has changed, we must make a “deep comparison” - recursively check all the fields inside the state and prop to see if any of them have changed. Large applications usually have a very deep state structure when using redux - several nested levels . Doing a deep comparison here, perhaps several times every second, will slow down the UI. On the other hand, if we make a “shallow comparison” , it will be much quicker, but we may miss out on updates - breaking application logic.
let oldState={ name: "John", age: 20, profession: { title: "Software Engineer", organization: "SuperTokens.io" } } let newState=oldState newState.profession.title="Senior Software Engineer" // Shallow comparison. upto level one if { // Update UI } In the if statement above, the UI won’t update, even though we intended to change the state. This is because the reference of
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