Editor's pickJavaScriptArraysObjectsMap
How to Remove Duplicate Objects from a JavaScript Array
Learn to remove duplicate objects from a JavaScript array by ID with Set and Map. Preserve order, choose which record wins, and handle missing IDs.
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Editor's pickJavaScriptMap
JavaScript Map vs Object: Which One Should You Use?
Compare JavaScript Map vs Object by key types, iteration, size, serialization, and property behavior, then choose the right structure for your use case.
JavaScriptArray.sort
Why JavaScript Array.sort() Gives the Wrong Numeric Order
Learn why JavaScript sort() orders numbers like strings, how to write ascending and descending comparators, and how to avoid mutating arrays.
JavaScriptoptional chaining
JavaScript Optional Chaining and Nullish Coalescing: Common Mistakes Explained
Learn how JavaScript optional chaining and nullish coalescing work, compare ?? with ||, and avoid common mistakes involving falsy values and syntax.
JavaScriptURLSearchParams
How to Read and Modify URL Parameters in JavaScript
Learn to read, add, update, and delete URL parameters with JavaScript URLSearchParams, including duplicates, encoding, complete URLs, and validation.
URL parametersUTM tracking
How to Remove Tracking Parameters from URLs Without Breaking Links
Learn how to remove UTM tags, fbclid, and gclid while preserving query parameters needed for search, filters, signed links, and site functionality.