F# Built-in Functions
In F#, built-in functions are pre-defined and hence, they can be directly used in any F# program without any need for declaration. These built-in functions can be divided into various categories based on their functionality.
Syntax
The syntax for using a built-in function in F# is as follows:
functionName arg1 arg2 ... argN
Here, functionName is the name of the built-in function and arg1, arg2,...,argN are the arguments passed to the function.
Example
Let's consider an example where we want to find the absolute value of a number.
let x = -42
let absoluteX = abs x
printfn "The absolute value of %d is %d" x absoluteX
Output:
The absolute value of -42 is 42
Explanation
In the above example, we have used the abs function to find the absolute value of a number. The abs function is a built-in function in F# which returns the absolute value of a number.
Use
Built-in functions in F# can be used for a variety of purposes such as:
- Mathematical calculations like finding the square root, trigonometric functions, etc.
- String operations like concatenation, length, etc.
- Type conversions
- Date and time operations
- File system operations, etc.
Important Points
- Built-in functions are pre-defined in F# and can be directly used in a program without any need for declaration.
- The syntax for using a built-in function is
functionName arg1 arg2 ... argN. - Built-in functions in F# can be used for a variety of purposes such as mathematical calculations, string operations, type conversions, date and time operations, file system operations, etc.
Summary
In summary, F# provides a wide range of pre-defined built-in functions that can be used directly in a program. These functions can be used for a variety of purposes and save a lot of time and effort that would otherwise be required for implementing these functions from scratch.