https://github.com/aneldev/dyna-object-assign

Assign objects like `Object.assign` but it doesn't override undefined values. It doesn't mutate the object it returns a new one.
https://github.com/aneldev/dyna-object-assign

Last synced: 1 day ago
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Assign objects like `Object.assign` but it doesn't override undefined values. It doesn't mutate the object it returns a new one.

• Host: GitHub
• URL: https://github.com/aneldev/dyna-object-assign
• Owner: aneldev
• License: mit
• Created: 2018-10-16T08:18:20.000Z (about 6 years ago)
• Default Branch: master
• Last Pushed: 2022-12-09T05:22:30.000Z (almost 2 years ago)
• Last Synced: 2024-10-05T21:15:58.173Z (about 1 month ago)
• Language: JavaScript
• Size: 3.67 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 21
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# About

Assign objects like `Object.assign` but 

- it doesn't override with undefined values

- it doesn't mutate the object it returns a new one.

Written in TypeScript.

# With `Object.assign` we have

```

> objA = { name: "John", age: 32, address: undefined, city: null }

{ name: 'John', age: 32, address: undefined, city: null }

> objB = { address: "Lungerstrasse 12" }

{ address: 'Lungerstrasse 12' }

>  Object.assign({}, objA, objB) // or

> { ...objA, ...objB }

{ name: 'John', age: 32, address: 'Lungerstrasse 12', city: null }

// perfect

// now let's try the objB with an undefined value

> objB = { age: undefined, address: "Lungerstrasse 12" }

{ age: undefined, address: 'Lungerstrasse 12' }

> { ...objA, ...objB }

{ name: 'John',

  age: undefined,

  address: 'Lungerstrasse 12',

  city: null }

// the age here in overriden, this is correct... but in some cases not what we want

```

# With `dynaObjectAssign`

```

> objA = { name: "John", age: 32, address: undefined, city: null }

{ name: 'John', age: 32, address: undefined, city: null }

> objB = { age: undefined, address: "Lungerstrasse 12" }

{ age: undefined, address: 'Lungerstrasse 12' }

> dynaObjectAssign(objA. objB)

{ name: 'John',

  age: 32,                      // it is still 32 and overriden with undefined

  address: 'Lungerstrasse 12',

  city: null }

```

# Equivalents syntax of `dynaObjectAssign`

```

dynaObjectAssign(objA, objB) --> Object.assign({}, objA, objB)

dynaObjectAssign(objA, objB) --> {...objA, ...objB}

```

# dynaObjectAssign signature

`dynaObjectAssign = (...objs: Partial[]) => T`