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+---
+title: Loops
+---
+Allow the repetition of a group of instructions according to a computation.
+Every loop body defines its hierarchy level, from the local variables' point of
+view.
+
+### WHILE
+{{< fatecode >}}(while [BOOL] [I0 = INSTRUCTION] ... [IM = INSTRUCTION]){{< /fatecode >}}
+
+Executes `[I0]` ... `[IM]` if, and as long as, `[BOOL]` yields true.
+
+### DO WHILE
+{{< fatecode >}}(do_while [BOOL] [I0 = INSTRUCTION] ... [IM = INSTRUCTION]){{< /fatecode >}}
+
+Executes `[I0]` ... `[IM]`,  and does so again as long as, `[BOOL]` yields
+true.
+
+### FOR
+{{< fatecode >}}(for <pre = INSTRUCTION> [BOOL] <post = INSTRUCTION> [I0 = INSTRUCTION] ... [IM = INSTRUCTION]){{< /fatecode >}}
+
+Executes `<pre>`, then, if and as long as `[BOOL]` yields true, executes
+`[I0]` ... `[IM]` followed by `<post>`.
+
+### FOR EACH
+{{< fatecode >}}(foreach [COLLECTION] {String} [I0 = INSTRUCTION] ... [IM = INSTRUCTION]){{< /fatecode >}}
+
+Executes `[I0]` ... `[IM]` for each member of `[COLLECTION]`, in order. The current
+member is stored in a new local variable named `{String}`.
+
+### BREAK
+{{< fatecode >}}(break){{< /fatecode >}}
+
+Exits the current loop.