Exceptions: Difference between revisions
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Alextretyak (talk | contribs) m (→{{header|11l}}: X.throw) |
Langurmonkey (talk | contribs) |
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Exceptions in langur are hashes guaranteed to contain certain fields, even if they're empty. |
Exceptions in langur are hashes guaranteed to contain certain fields, even if they're empty. |
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<syntaxhighlight lang="langur"> |
<syntaxhighlight lang="langur">throw "not a math exception" |
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throw "not a math exception" |
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catch |
catch[.e] { |
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if .e |
if .e'cat == "math" { |
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# change result... |
# change result... |
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} else { |
} else { |
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} else { |
} else { |
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# no exception |
# no exception |
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} |
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... |
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</syntaxhighlight> |
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An else section on a catch is optional. You can also use else if. |
An else section on a catch is optional. You can also use else if. |
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catch { |
catch { |
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if _err |
if _err'cat == "math" { |
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# change result |
# change result |
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123 |
123 |
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} else { |
} else { |
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# rethrow the exception |
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throw |
throw |
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} |
} |
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} |
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</syntaxhighlight> |
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<syntaxhighlight lang="langur">val .safediv = |
<syntaxhighlight lang="langur">val .safediv = fn(.x, .y) { .x / .y ; catch : 0 } |
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.safediv(7, 7) # 1 |
.safediv(7, 7) # 1 |
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.safediv(7, 0) # 0 |
.safediv(7, 0) # 0 |
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</syntaxhighlight> |
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=={{header|Lasso}}== |
=={{header|Lasso}}== |
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