如何以功能方式修改对象的所有属性

Question

I need to create a function which create a new object with all properties of in set to true , the function should create a new object.

How to do it with vanilla js? I can use deconstruction and latest JS.

   const in = {
        ida:true,
        idb:false,
        idc:false,
        ide:true
    }

result wanted

const out = {
    ida:true,
    idb:true,
    idc:true,
    ide:true
}

Answer 1

You could map all keys with an new object and false as value. Later assign them to a single object.

 const inO = { ida: true, idb: false, idc: false, ide: true }, outO = Object.assign(...Object.keys(inO).map(k => ({ [k]: true }))); console.log(outO); 

Answer 2

Well, you could use Object.keys and the spread operator to accomplish this:

 const input = { ida: true, idb: false, idc: false, ide: true } const out = Object.keys(input).reduce((acc, key) => ({...acc, [key]: true}), {}); console.log(out) 

Answer 3

You can use a for..in loop which iterates over the keys of an object:

 function setTrue(obj) { for (k in obj) obj[k] = true; } const o = { ida: true, idb: false, idc: false, ide: true } setTrue(o); console.log(o);