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ApplyFunction ( function ; value )

Define an apply a temporary, anonymous function to a value

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Debi Fuchs - Show more from this author Aptworks Consulting http://www.aptworks.com

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/** * ===================================== * ApplyFunction ( function ; value ) * * RETURNS: * the result of applying a temporarily defined, anonymous function * to a value * * EXAMPLE: * ApplyFunction( "[n]*[n]+2"; 3 ) //returns 11 * * * PARAMETERS: * function: a function literal * value: the value to pass to the function in place of [n] * * DEPENDENCIES: none * * NOTES: * This CF can be used not only to define simple, temporary, anonymous * functions, but also functions which can be: named, passed multiple * arguments, combined with other temporary functions, and even * recurse. See examples below. * * HISTORY: * 2008 - Wrote similar function "Apply" * 10/25/2014 - improved and released as "ApplyFunction" * * CREDITS: Thanks to Agnès Barouh for the idea of the "[n]" style * function call syntax. Also, I find it hard to believe that * I am the first and/oronly one to write this exact code, so * greetings to my co-authors, as well. * * The MIT License (MIT) * * Copyright (c) 2014 Deborah Fuchs * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. * * * BASIC EXAMPLE: * * ApplyFunction( "[n]*[n]+2"; 3 ) // --> 11 * * NAMED EXAMPLE: * * Let( * square = "[n]*[n]"; * ApplyFunction( square; 3 ) + * ApplyFunction( square; 4 ) * ) // --> 25 * * MULTIPLE ARGUMENT EXAMPLE: * * Let( * exp = "GetValue([n];1) ^ GetValue([n];2)"; * ApplyFunction( exp; List(2;5) ) + ApplyFunction( exp; List(3;4) ) * ) // --> 113 * * RECURSIVE EXAMPLE: * * Let( * $factorial_fn= "if([n]=0;1;[n]*ApplyFunction($factorial_fn; [n]-1))"; * ApplyFunction($factorial_fn; 5) * ) // --> 120 * * MUTUALLY RECURSIVE EXAMPLE: * * Let( * [ * $even_fn = "if([n]=0; 1; ApplyFunction($odd_fn; [n]-1))"; * $odd_fn = "if([n]=0; 0; ApplyFunction($even_fn; [n]-1))" * ]; * ApplyFunction($even_fn; 8) * ) // --> 1 * * * * ===================================== */ Evaluate( "Let([n=" & Quote(value) & "];" & Substitute( function; "[n]"; "n" ) & ")" ) Click to copy

Apply a temporarily defined, anonymous function to a value. This CF can be used not only to define simple, temporary, anonymous functions which are unworthy of their own custom functions, but also ones which are slightly less simple. See examples for more information.

 

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