Embracing Array Immutability with Copy Changes
GitHub - tc39/proposal-change-array-by-copy: Provides additional methods on Array.prototype and…
Provides additional methods on Array.prototype and TypedArray.prototype to enable changes on the array by returning a…
This proposal, put forth by Ashley Claymore and Robin Ricard, aims to revolutionize the way we deal with arrays by advocating for immutability.
Immutability, an essential aspect of functional programming, reduces bugs and complications arising from shared state and mutable data. Embracing immutability helps programmers write safer and more predictable code. This is where the Change Array by Copy proposal steps in.
Unleashing the Power of “Change Array by Copy”
splice() mutate the array in place. Though useful in many scenarios, these methods can lead to unexpected side effects when dealing with shared state, especially in complex applications.
The Change Array by Copy proposal introduces new methods that create a new copy of the array, leaving the original array unchanged. These methods are
toSpliced. They act as immutable counterparts to
An additional method,
with(), is also introduced. This method provides a more intuitive way to replace an element at a specific index without mutating the original array.
Let’s explore these new methods.
toReversed method returns a new array that is the reverse of the original array, leaving the original array unchanged. Here’s how it works:
const original = [1, 2, 3, 4];
const reversed = original.toReversed();
// [ 1, 2, 3, 4 ]
// [ 4, 3, 2, 1 ]