Compose function: Difference between revisions
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#REDIRECT [[Functional Composition]] |
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{{task}} |
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Write a function <code>compose</code> which takes as arguments two functions f and g taking one argument each and returns a function which takes one argument x and returns f(g(x)). Demonstrate that function by calculating both <code>compose(f,g)</code> and <code>compose(g,f)</code> with the functions f(x) = x+1 and g(x) = 2x, and applying both functions to the number 7. In the first case, the result should be 15, in the second case, it should be 16. |
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=={{header|JavaScript}}== |
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{{works with|Iceape|1.0.9}} |
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<lang javascript> |
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function compose(f,g) |
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{ |
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return new Function("x", "return "+f+"("+g+"(x))"); |
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} |
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function f(a) |
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{ |
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return a+1; |
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} |
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function g(a) |
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{ |
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return 2*a; |
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} |
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alert("compose(f,g)(7) = "+compose(f,g)(7)); |
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alert("compose(g,f)(7) = "+compose(g,f)(7)); |
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</lang> |
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Revision as of 17:14, 25 March 2009
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