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JavaScript in Practice: Getting Started

The Do-While Loop

Learn about the do-while loop, which is another way to repeat a code segment.

We'll cover the following...

The do-while loop executes the loop body at least once and checks the condition before the end.

Node.js
let numbers = [19, 65, 9, 17, 4, 1, 2, 6, 1, 9, 9, 2, 1];
 
function sumArray( values ) {
    if (  values.length == 0 ) return 0;
    let sum = 0;
    let i = 0;
    do {
        sum += values[i];
        i += 1;
    } while ( i < values.length );
    console.log( 'The loop was executed ' + i + ' times' );
    return sum;
}
 
sumArray( numbers );

Notice the first line in the function. We have to exit the sumArray function before reaching the do-while ...