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---
title: Instructions
weight: 5
---
Instructions do not return values, but modify the memory in some way or
interact with the interpreter. Computations are valid instructions, and will be
automatically converted into `[TEXT]` to be displayed.
### ASSERT
{{< fatecode >}}(assert! [BOOL] [TEXT]){{< /fatecode >}}
Raises the exception `[TEXT]` to the interpreter if `[BOOL]` yields
false.
### DONE
{{< fatecode >}}(done!){{< /fatecode >}}
Completes the execution of the current sequence.
### END
{{< fatecode >}}(end!){{< /fatecode >}}
Completes the execution of the script.
### SET VALUE
{{< fatecode >}}(set! [REFERENCE] [COMPUTATION]){{< /fatecode >}}
Gives the value `[COMPUTATION]` to `[REFERENCE]`.
### VISIT SEQUENCE
{{< fatecode >}}(visit! {String} [C0 = COMPUTATION] ... [CN = COMPUTATION]){{< /fatecode >}}
{{< fatecode >}}(visit! [SEQUENCE] [C0 = COMPUTATION] ... [CN = COMPUTATION]){{< /fatecode >}}
Visits the sequence named `{String}` (or stored in `[SEQUENCE]`), with `C0` ...
`CN` as arguments. That sequence does not need to already have been defined.
Visiting a sequence means that the execution of the current sequence continues
once the visited sequence has completed.
### JUMP TO SEQUENCE
{{< fatecode >}}(jump_to! {String} [C0 = COMPUTATION] ... [CN = COMPUTATION]){{< /fatecode >}}
{{< fatecode >}}(jump_to! [SEQUENCE] [C0 = COMPUTATION] ... [CN = COMPUTATION]){{< /fatecode >}}
Jumps to the sequence named `{String}` (or stored in `[SEQUENCE]`), with `C0`
... `CN` as arguments. That sequence does not need to already have been
defined. Jumping to a sequence means that the execution of the current sequence
is replaced by that of the target sequence.
### INSTRUCTION LIST
{{< fatecode >}}( [C0 = INSTRUCTION] ... [CN = INSTRUCTION]){{< /fatecode >}}
Instruction corresponding to the execution of `[C0]` ... `[CN]` in order.
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