tiluntil

Tiluntil is a hypothetical control-flow construct discussed in theoretical and esoteric programming language literature. It is described as a loop that repeats a block of statements until a specified condition becomes true, making it semantically close to the traditional until or do-while constructs found in other languages. In discussions, tiluntil is often used to explore naming, syntax, and the trade-offs between different looping flavors.

Semantics and equivalence. Tiluntil is typically defined so that the loop body executes at least once and continues to run while the condition evaluates to false. When the condition becomes true, execution exits the loop. This behavior is functionally equivalent to do { ... } while (!condition) in languages with a do-while construct, and is also closely related to the standard until loop found in some languages. The exact semantics can vary by hypothetical language, but the common thread is the emphasis on repeating until a terminating condition holds.

Syntax and examples. In pseudo-code, a tiluntil loop might appear as:

tiluntil (condition) {

statements

}

This means: execute statements, then re-check condition, repeating until condition is true. Some variations might present tiluntil with a different keyword arrangement or with a colon-based block, such as:

tiluntil condition:

statements

In practice, many real languages provide equivalent functionality via do-while or repeat-until constructs, so tiluntil remains mainly a topic of comparative discussion rather than a widely implemented feature.

See also. While loop, do-while loop, repeat-until loop, control-flow constructs.