Obj

empty

RES
let empty: unit => {..}

empty() returns the empty object {}.

assign

RES
let assign: ({..}, {..}) => {..}

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.

RES
/* Copy an object */

let obj = {"a": 1}

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

/* prints "{ a: 1 }" */
Js.log(copy)

/* Merge objects with same properties */

let target = {"a": 1, "b": 1}
let source = {"b": 2}

let obj = Js.Obj.assign(target, source)

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

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

keys

RES
let keys: {..} => array<string>

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