I think that array is reference types but when i run this code the result seem not like that

let a = [1, 2, 3]
let b = a
a = [1, 2]
console.log(b)

I expected that the result will be 1, 2 but it is 1, 2, 3

>Solution :

You’ve changed the pointer of the variable a to a new array, but the old array still exists because b is still pointing to it. All you’ve done is reassign the array that the variable a is now pointing to.

This is working as expected. You’ll get the result you were trying to achieve by mutating the array a is pointing to instead of completely reassigning it. Ie

let a = [1, 2, 3]
        let b = a
        a.pop()
        console.log(b)