A guide to using ??= in JavaScript to handle null and undefined values elegantly

Steven Burrows

Heroku

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The nullish coalescing assignment operator `??=` in JavaScript, added in ECMAScript 2021, assigns a default value to a variable only if it is `null` or `undefined`. This operator helps in preserving falsy values like 0 or an empty string that might be valid and prevents unintentional bugs in applications.

JavaScript's ??= Operator: Default Values Made Simple