Functional Programming in JavaScript by Unknown

Author:Unknown
Language: eng
Format: epub, pdf
Publisher: Packt Publishing

First we need to make the curried and partial-applied functions, then we can compose them to our other composed functions.

var lighterColors = lighterColor .compose(nums2hex.curry()); var darkerRed = darkerColor .compose(nums2hex.partialApply(255)); Var lighterRgb2hex = lighterColor .compose(nums2hex.partialApply()); console.log( lighterColors(123, 0, 22) ); // Returns: 8cff11 console.log( darkerRed(123, 0) ); // Returns: ee6a00 console.log( lighterRgb2hex(123,200,100) ); // Returns: 8cd975

There we have it! The functions read really well and make a lot of sense. We were forced to begin with little functions that just did one thing. Then we were able to put together functions with more utility.

Let's look at one last example. Here's a function that lightens an RBG value by a variable amount. Then we can use composition to create new functions from it.

// lighterColorNumSteps :: string -> num -> string function lighterColorNumSteps(color, n) { for (var i = 0; i < n; i++) { color = lighterColor(color); } return color; } // now we can create functions like this: var lighterRedNumSteps = lighterColorNumSteps.curry().compose(reds)(0,0); // and use them like this: console.log( lighterRedNumSteps(5) ); // Return: 'ff5555' console.log( lighterRedNumSteps(2) ); // Return: 'ff2222'

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