Function composition: Difference between revisions
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(→{{header|RPL}}: actually composes 2 functions - previous version only evaluated them one after the other) |
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=={{header|RPL}}== |
=={{header|RPL}}== |
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RPL allows x to be a value or a variable. In this case, the function returns an expression. |
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« →STR SWAP →STR + |
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DUP "»«" POS " " REPL STR→ |
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≪ SWAP EVAL SWAP EVAL ≫ |
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» '<span style="color:blue">FCOMP</span>' STO <span style="color:grey">@ ''( « f » « g » → « f o g » )''</span> |
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'FCOMP' STO |
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≪ ALOG ≫ ≪ COS ≫ |
≪ ALOG ≫ ≪ COS ≫ <span style="color:blue">FCOMP</span> |
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≪ ALOG ≫ ≪ COS ≫ |
≪ ALOG ≫ ≪ COS ≫ <span style="color:blue">FCOMP</span> 0 EVAL |
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≪ ALOG ≫ ≪ COS ≫ <span style="color:blue">FCOMP</span> 'x' EVAL |
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{{out}} |
{{out}} |
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<pre> |
<pre> |
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3: ≪ COS ALOG ≫ |
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2: 10 |
2: 10 |
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1: 'ALOG(COS(x))' |
1: 'ALOG(COS(x))' |
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</pre> |
</pre> |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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This <tt>compose</tt> method gets passed two Method objects or Proc objects |
This <tt>compose</tt> method gets passed two Method objects or Proc objects |
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