Format
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⍕
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Format (⍕) is a primitive function.
Examples
Format in its monadic form, alongside ravel, allows the user to concatenate numbers with strings:
supper ← 10
'I ate ',⍕supper,'shrimp.'
I ate 10 shrimp.
It is very powerful when combined with execute, which allows the user to interpret a string as APL code:
data ← 7
⍎'6 × ',⍕data
42