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 = <T>(...objs: Partial<T>[]) => T