Module Js_obj

empty () returns the empty object \{\}

assign target source copies properties from source to target

Properties in target will be overwritten by properties in source if they have the same key.

Returns target

(* Copy an object *)

let obj = [%obj { a = 1 }]

let copy = Js.Obj.assign (Js.Obj.empty ()) obj

(* prints "{ a: 1 }" *)
let _ = Js.log copy

(* Merge objects with same properties *)

let target = [%obj { a = 1; b = 1; }]
let source = [%obj { b = 2; }]

let obj = Js.Obj.assign target source

(* prints "{ a: 1, b: 2 }" *)
let _ = Js.log obj

(* prints "{ a: 1, b: 2 }", target is modified *)
let _ = Js.log target

• see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign

  MDN

keys obj returns an array of the keys of obj's own enumerable properties

• see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys

  MDN