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do

The do keyword introduces the body of a do...while loop, which executes its block at least once and then repeats while the trailing while condition is truthy.

Syntax & Example​

let i = 0;
do {
    print(i);
    i += 1;
} while i < 3;

Use Cases​

  • Loops that must run their body at least once before testing a condition.
  • Prompt-then-retry interactions and retry loops.

See also: while.