By Robert Pickering
Sensible programming (FP) is the way forward for .NET programming, and F# is far greater than simply an FP language. each specialist .NET programmer must know about FP, and theres no higher method to do it than through studying F#and no more uncomplicated approach to examine F# than from Foundations of F#.
If youre already accustomed to FP, youll locate F# the language youve regularly dreamed of. And all .NET programmers will locate F# a thrilling real-world replacement to C# and visible uncomplicated. This e-book is probably going to have many imitators, yet few real rivals. Written through F# evangelist Rob Pickering, and tech reviewed via F#s major dressmaker, Don Syme, this can be a sublime, accomplished advent to all features of the language and an incisive advisor to utilizing F# for real-world specialist improvement. F# is the way forward for programming (not simply on .NET), and the longer term is now.
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This behavior may not always be appropriate; for example, if the function takes two floating-point parameters that represent a point, it may not be desirable to have these numbers passed to the function separately because they both make up the point they represent. You may alternatively surround a function’s parameters with parentheses and separate them with commas, turning them into a tuple (rhymes with “couple”). You can see this in the following code, which will not compile because the sub function requires both parameters to be given at once.
The third and fourth lines show intermediate values being calculated. First the difference between the two numbers is calculated, and this is assigned to the identifier dif using the let keyword. To show that this is an intermediate value within the function, it is indented by four spaces. The choice of the number of spaces is left to the programmer, but the convention is four. Note that you cannot use tabs because these can look different in different text editors, which causes problems when whitespace is significant.
In this way it differs from many pure functional languages, where the notion of control flow is very loose, because expressions can be evaluated in essentially any order. You can see the strong notion of control flow in the following if … then … else … expression. In F# the if … then … else … construct is an expression, meaning it returns a value. One of two different values will be returned, depending on the value of the Boolean expression between the if and then keywords. The next example illustrates this.