Unary Operators - JavaScript Programming

In all the below exercises you have to predict the output yourself without running/executing the code. Predict the value of each variable after that statement gets executed.

for e.g.

let a = 1;       // a = 1
a++;             // a = 2
let b = a + 3;   // a = 2     b = 5
let c = a + b;   // a = 2     b = 5     c = 7

Q1.

What is the value of each variable in each line of code?

let a = 5;
let b = a++;
b = ++a;

Q2.

What is the value of each variable in each line of code?

let x = 5;             
let y = --x;           
let z = y--;           
x = ++z;               
y = --z;               
z = x++;

Q3. (Adv.)

What is the value of each variable in each line of code?

let x = 5;              
let y = --x;            
x = x++;                
let z = y--;            
x = ++z;                
y = --z;                
z = z++;

Q4. (Adv.)

What is the value of each variable in each line of code?

let z = 5;         
z = z--;           
z += z++;          
z -= --z;