Named parameters: Difference between revisions
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example(:grill => "lamb kebab", :bar => 3.14) |
example(:grill => "lamb kebab", :bar => 3.14) |
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# => "foo is 0, bar is 3.14, and grill is lamb kebab"</lang> |
# => "foo is 0, bar is 3.14, and grill is lamb kebab"</lang> |
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=={{header|Scheme}}== |
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<lang scheme> |
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(define (keyarg-parser argdefs args kont) |
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(apply kont |
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(map (lambda (argdef) |
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(let loop ((args args)) |
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(cond ((null? args) |
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(cadr argdef)) |
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((eq? (car argdef) (car args)) |
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(cadr args)) |
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(else |
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(loop (cdr args)))))) |
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argdefs))) |
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(define (print-name . args) |
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(keyarg-parser '((first #f)(last "?")) |
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args |
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(lambda (first last) |
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(display last) |
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(cond (first |
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(display ", ") |
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(display first))) |
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(newline)))) |
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</lang> |
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<lang scheme> |
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=> (print-name) |
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? |
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=> (print-name 'first "John") |
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?, John |
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=>(print-name 'first "John" 'last "Doe") |
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Doe, John |
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=>(print-name 'last "Doe") |
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Doe |
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</lang> |
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=={{header|Smalltalk}}== |
=={{header|Smalltalk}}== |
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