While loop

Execute a code block repeatedly *while* a condition evaluates to true: it's the primary control flow for indefinite iteration.

This control structure is entry-controlled: the boolean condition is evaluated *before* the first execution. The loop body runs only if the condition is `true`. We deploy this for indefinite iteration (when the number of passes isn't known beforehand), such as processing user input until a valid value is received. Critical operational note: always ensure the loop body contains logic (e.g., incrementing a counter like `i++` or updating a data state) that will eventually make the condition `false`, preventing an infinite loop scenario.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/while