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Determine if a string is numeric: Difference between revisions
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{{works with|Dyalog APL}}
<lang apl> ⊃⎕VFI{w←⍵⋄((w='-')/w)←'¯'⋄w}'152 -3.1415926 Foo123'
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<lang apl>
⍝ Use more recent features @ or ⎕R
⊃⎕VFI {'¯' @ ('-'∘=) ⊣⍵} '152 -3.1415926 Foo123' ⍝ Fast: replacement of - with APL high-minus
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⊃⎕VFI '-' ⎕R '¯' ⊣ '152 -3.1415926 Foo123' ⍝ Simple: (ditto)
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