While-statement

While-statements allow a certain piece of code to be executed repeatedly, as long as a condition remains true.

The while-statement starts with the while keyword, followed by the condition, and the code that should be repeatedly executed if the condition is true inside opening and closing braces. The condition must be boolean and the braces are required.

The while-statement will first evaluate the condition. If the condition is false, the execution is done. If it is true, the piece of code is executed and the evaluation of the condition is repeated. Thus, the piece of code is executed zero or more times.

var a = 0
while a < 5 {
    a = a + 1
}

// `a` is `5`