let n; let b = (n =1) +(n=4);

Question

b is 5
My question is that, isn't the expression (n=4) supposed to change the previous (n=1), which would change n everywhere to 4, which indirectly should make the above expression =>
let b = 4 + 4 // b === 8
Am i bit confused on why it is not working that way

Answer 1

Ink_ross,

let n; b = (n=1) + (n=4);
console.log(n);
console.log(b);

4
5

Above is output of code,

Sub-Expression first evaluated n=1 it returns current value of 1. second Sub-Expression is evaluated n=4 it returns 4. Because first evaluation set n to 1 and second evaluation set n to 4.

b = (n=1) + (n=4);
b = 1 + (n=4) n = 1
b = 1 + 4 n = 4
b = 5 n = 4

Because of evaluation happens from left to right.

This may help

DHANANJAY PATEL