Why array is not updated in this example, strange? [closed]

Question

Output should be [2,3,5,9] for both a and b as per me, as they both point to same address, and the data has a push of 9. Why the result is still the old data of [2,3,5]?

var a = [2,3,5];
var b = a; 
b.push[9];
console.log(a, b);

Answer 1

Wrong brackets you need to do b.push(9)