Control Flow
Do-While Loop in JavaScript
The while loop executes a block of code while a boolean expression evaluates to true. It checks the boolean expression after each iteration. It terminates as soon as the expression evaluates to false.
Syntax
do {
//block of code to be executed
} while(booleanExpression);Notes
Because the do-while loop evaluates the boolean expression at the end of the iteration, the block of code within the loop is guaranteed to run at least once.
booleanExpression results in either a true or false output. It is created using comparing operators (==, >, =, <=, !=).
There can also be multiple boolean expressions within the parentheses (booleanExpression). The boolean expressions are connected through logical operators (&&, ||, !).
Example
var count = 0;
do {
document.write("We are at " + count);
count++;
} while(count < 10);