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add BQN
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ERROR 100, "Not found"
ENDIF</lang>
=={{header|BQN}}==
Generally, <code>⊐</code>(Index Of) is used to findex the indices of the right argument array's elements in the left argument. It returns the length of the left argument <code>𝕨</code> if the argument is not present.
The given <code>IndexOf</code> function is written to satisfy question requirements(throwing exceptions), and it is not recommended for use in production.
<lang bqn>list ← ⟨"Zig", "Zag", "Wally", "Ronald", "Bush", "Krusty", "Charlie", "Bush", "Boz", "Zag"⟩
IndexOf ← {
("Error: '" ∾𝕩∾ "' Not found in list") ! (≠𝕨)≠ind ← ⊑𝕨⊐⋈𝕩
ind
}
•Show list ⊐ "Wally"‿"Hi" # intended
•Show list IndexOf "Wally"
list IndexOf "Hi"</lang><lang>⟨ 2 10 ⟩
2
! "Error: 'Hi' Not found in list"
("Error: '" ∾𝕩∾ "' Not found in list") ! (≠𝕨)≠ind ← ⊑𝕨⊐⋈𝕩
^
list IndexOf "Hi"
^^^^^^^</lang>
=={{header|Bracmat}}==
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