push value in array in value of particular key in object js code example

Example: javascript push object into array with variable key

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

//OR

//If you're able to use ES6 and Babel, you can use this new feature:

{
    [yourKeyVariable]: someValueArray,
}