Using the do while Loop for Iteration
Let's consider the do-while loop. This loop is similar to the while loop but has a key distinction.
| while | do-while |
|---|---|
| Executes code block after the condition check. | Executes code block before the condition check. |
Syntax
The do-while loop begins with the do keyword, encloses the code block within curly braces {}, and concludes with the while keyword followed by the condition in parentheses () without the need for an additional code block:
do {
// code block
} while (condition);
Here's an example:
123456let a = 0; do { console.log(a); a++; } while (a <= 3 && a >= 1);
At the outset, the variable a was initialized to 0, and the condition a >= 1 was evaluated after the a++ operation.
The code block within the do is guaranteed to be executed at least once:
123456789// `while` loop while (false) { console.log("while"); // Not executed } // `do-while` loop do { console.log("do-while"); // Executed 1 time } while (false);
The do-while loop is particularly useful when you need to prompt the user for input at least once and continue until the user enters valid data or meets a specific condition.
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Completion rate improved to 2.33Using the do while Loop for Iteration
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Let's consider the do-while loop. This loop is similar to the while loop but has a key distinction.
| while | do-while |
|---|---|
| Executes code block after the condition check. | Executes code block before the condition check. |
Syntax
The do-while loop begins with the do keyword, encloses the code block within curly braces {}, and concludes with the while keyword followed by the condition in parentheses () without the need for an additional code block:
do {
// code block
} while (condition);
Here's an example:
123456let a = 0; do { console.log(a); a++; } while (a <= 3 && a >= 1);
At the outset, the variable a was initialized to 0, and the condition a >= 1 was evaluated after the a++ operation.
The code block within the do is guaranteed to be executed at least once:
123456789// `while` loop while (false) { console.log("while"); // Not executed } // `do-while` loop do { console.log("do-while"); // Executed 1 time } while (false);
The do-while loop is particularly useful when you need to prompt the user for input at least once and continue until the user enters valid data or meets a specific condition.
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