While

Evaluates an expression repeatedly while a test stays true.

Wolfram LanguageWhile↗

While(test)Re-evaluates $test$ until it reads other than $True$.

While(test, body)Evaluates $body$ each time $test$ (re-evaluated first) reads $True$; stops as soon as it doesn't.

Typed signatures

Type	Package	Applies
(any, any?) -> any	combinatorics	always

Domain: Collections

Details

• Always returns $Nothing$, like Do.
• Capped at 4096 iterations, past which the loop simply stops — Wolfram's own default cap, $IterationLimit, is much larger and configurable; this one is fixed.

Examples

Basic #

count up to a limit

live ↗

In$\bigl\lbrack n\coloneq0, \mathrm{While}(n\lt5, n\coloneq n+1), n\bigr\rbrack$Out$\bigl\lbrack0, 5\bigr\rbrack$

About

Examples	1
Crosswalk	Wolfram Language

See also: Do, NestWhile