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---
title: Conditionals
---
This page presents the computation operators that allow a choice depending on
some condition. All possible returned values must be of the same type.
### IF-ELSE
{{< fatecode >}}(if_else [BOOL] [C0 = COMPUTATION] [C1 = COMPUTATION]){{< /fatecode >}}
Returns `C0` is `[BOOL]` yields true, `C1` otherwise.
### COND
{{< fatecode >}}(cond ([B0 = BOOL] [C0 = COMPUTATION]) ... ([BN = BOOL] [CN = COMPUTATION])){{< /fatecode >}}
Returns `[CI]`, such that `[BI]` is the first to hold true. If there is not such
`Bi`, returns `[CN]`.
### SWITCH
{{< fatecode >}}(switch [T = COMPUTATION] ([V0 = COMPUTATION] [C0 = COMPUTATION]) ... ([VN = BOOL] [CN = COMPUTATION]) [D = COMPUTATION]){{< /fatecode >}}a
Returns the first `CI` such that `VI` is equal to `T`. If there is not such
`VI`, returns `[D]`.
## Examples
{{< fatecode >}}(cond
((false) (false))
((false) (false))
((true)
(cond
((false) (false))
((true) (not (is_member 3 test_list)))
((true) (false))
)
)
)
{{< /fatecode >}}
{{< fatecode >}}(switch 3
(0 (false))
(1 (false))
(3 (true))
(2 (false))
(false)
)
{{< /fatecode >}}
{{< fatecode >}}(if_else (true)
(if_else (false)
(assert (false) FAILED: instruction ifelse E)
(set test_var (true))
)
(assert (false) FAILED: instruction ifelse F)
)
{{< /fatecode >}}
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