Вивчайте The `do-while` Loop

The do-while is very similar to a while loop, except it is always executed at least once, even if the loop condition is false.

Another difference is that the code block is executed before the loop condition is checked.

The general syntax of a do-while loop is the following:

do {
  // code to execute
} while(boolean_expression);

The flowchart describes the execution process of a do-while loop:

For example, following is a program which uses a do-while loop to print the first ten even numbers:


              123456
            
let i = 1;

do { 
  console.log(i * 2);
  i += 1;
} while (i <= 10);

Even if we change the value of i, such that the condition becomes false, the code block will still execute at least once:


              123456
            
let i = 11;

do { 
  console.log(i * 2);
  i += 1;
} while (i <= 10);

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