Postfix Increment in While Loop Javascript-CodePudding

Could anybody explain to me please why this loop

let i = 0
while (i < 5) {
    i  
    console.log(i)  
}

shows 1,2,3,4,5 ?

As I know postfix increment returns the old value, right? so first shouldn't it log 0 into the console?

Thank you

CodePudding user response：

That is true, when executing as one statement. You have separated it in 2 lines, so 2 statements, each one is executed sequentially

The following code would do it

let i = 0
while (i < 5) {
    console.log(i  )  
}
console.log("===============")
i = 0
while (i < 5) {
    a = i  
    console.log(a)  
}

Whereas the prefix increment does 12345

let i = 0
while (i < 5) {
    console.log(  i)  
}
console.log("===============")
i = 0
while (i < 5) {
    a =   i
    console.log(a)  
}

CodePudding user response：

Before printing to the console, the code does this: i , which increments i. Then, the code prints the value of i, which is now 1.