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defu

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defu

Recursively assign default properties. Lightweight and Fast!


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5.7M
decreased by-6.15%
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1
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What is defu?

The defu npm package is a utility for performing default deep assignments on objects. It is commonly used to merge a set of objects into a single object, where the properties of later objects will overwrite those of earlier ones if they exist. This is particularly useful for managing configurations or options objects where default values need to be easily overridden by user inputs or other sources.

What are defu's main functionalities?

Deep Object Merging

This feature allows for the deep merging of objects. Properties from the second object (`objB`) are merged into the first object (`objA`), with nested properties being merged rather than replaced. This is useful for combining configurations with nested structures.

{"const defu = require('defu');\nconst objA = { foo: { bar: true } };\nconst objB = { foo: { baz: false }, qux: 1 };\nconst result = defu(objA, objB);\nconsole.log(result); // Output: { foo: { bar: true, baz: false }, qux: 1 }"}

Array Merging

This demonstrates how `defu` can be used to merge arrays contained within objects. Instead of replacing the array in `arrA` with the one in `arrB`, `defu` concatenates the arrays, preserving the order and contents of both.

{"const defu = require('defu');\nconst arrA = { arr: [1, 2] };\nconst arrB = { arr: [3, 4] };\nconst result = defu(arrA, arrB);\nconsole.log(result); // Output: { arr: [1, 2, 3, 4] }"}

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Package last updated on 05 Jan 2024

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