how to addition value in array in javascript code example

Example 1: adding numbers in an array javascript

console.log(
  [].reduce((a, b) => a + b)
)

Example 2: how to make and add to an array in javascript

var arrayExample = [53,'Hello World!'];
console.log(arrayExample) //Output =>
[53,'Hello World!']

//You can also do this
arrayExample.push(true);

console.log(arrayExample); //Output =>
[53,'Hello World!',true];