js use varible in key code example

Example 1: variable key name js

//You need to make the object first, then use [] to set it.

var key = "happyCount";
var obj = {};
obj[key] = someValueArray;
myArray.push(obj);

Example 2: how to use variable in js key

ES6 defines ComputedPropertyName
var thetop = "top",
    obj = { [thetop]: 10 };

console.log(obj.top); // -> 10