用于创建具有字符串值属性名称的对象的文字或表达式

Question

The following code creates an object in which the property name is set at runtime:

let pn = "xyz", ob = {}
op[pn] = 999

Is there any way to do that in a single step, as either a literal or an expression, and avoid the explicit assignment?

let pn = "xyz", ob = { <clever stuff goes in here> }

[Obviously I could write my own function, but where's the fun in that?]

Answer 1

How about that by just using brackets [] ?

 /* // old way :) let pn = "xyz", ob = {} ob[pn] = 999 console.log(ob) */ //clever stuff goes here :) let pn = "xyz", ob = { [pn]:999 } console.log(ob) 

Answer 2

You can define key with in the object like this

 let obj={[pn="Xyz"]:999}
 console.log(obj);