List of Destructive and Non-Destructive JavaScript Array Methods
Essays and updates on product, engineering, and AI by Chase Adams.
1 minute read
I can never remember which JavaScript Array methods are destructive and which are non-destructive.
A destructive method modifies the original array that the method is being run on. An example of this is pop:
const instruments = ["Guitar", "Drums", "Keyboard"];
instruments.pop();
// instruments = ["Guitar", "Drums"]
A non-destructive method does not modify the original array and instead returns a shallow copy of the original value. An example of this is map:
const instruments = ["Guitar", "Drums", "Keyboard"];
instruments.map(instrument => `${instrument} toot`);
// instruments = ["Guitar", "Drums", "Keyboard"]
Destructive Methods
Non-Destructive Methods
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