6/19/2023 0 Comments Find all javascriptIf your objects are JSON-safe, then this will work great, even for nested objects. To get Set to compare objects by their contents, you’ll need to take advantage of JSON.stringify() and JSON.parse() in order to turn the objects into string primitives in JSON format that can be compared by Set. Comparing objects by reference is the default behavior of Set. To find objects with unique references, you need to make a Set from the array. Objects with unique references are different objects in memory, even if they have the exact same contents, like a deep clone of a JavaScript object. An object’s contents (its key-value pairs or entries).An object’s reference (its variable name or location in memory).However, JavaScript has two definitions of what makes a unique object: When you have an array of objects in JavaScript, you usually want to work with the unique objects - you don’t want any duplicate objects that could cause bugs or a poor user experience. I refer to this as finding unique objects by content, where content means key-value pairs (also called entries).Ĭonclusion: Finding Distinct JavaScript Objects In doing so, you can find the distinct objects by removing any that have duplicate key-value pairs. However, you can also filter an array of objects while comparing their contents using Set. In that case, where the same exact object has been added multiple times, Set will help you remove the nonunique object references, leaving just one copy. Set is still very useful for removing duplicate objects from an array since it’s possible to add an object stored in a variable multiple times to an array. That’s because JavaScript objects, even those with the exact same contents, have different object references, also known as pointers in memory. However, Set works differently with primitive values compared to when working with JavaScript objects. You may already be familiar with the basic idea of Set - you can only add each value to a Set once, leaving a list of only the unique items.
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