F# if then

Syntax

The syntax for if then statement in F# is as follows:

if condition then
   // code to execute when the condition is true
else
   // code to execute when the condition is false

Example

Here is an example of if then statement in F#:

let number = 10

if number % 2 = 0 then
   printfn "%d is an even number." number
else
   printfn "%d is an odd number." number

Output:

10 is an even number.

Explanation

if then statement is used in F# to execute a specific code block if a condition is true and another code block if the condition is false. In the above example, the condition is checked using % operator to see if the remainder of number divided by 2 is equal to 0. If it is true, it prints number is an even number, otherwise, it prints number is an odd number.

Use

if then statement is used for decision making based on the result of a condition. It is commonly used in programming to execute specific code based on the result of a condition.

Important Points

• In F#, the if then statement must have one then block and optionally one else block.
• The condition must be a boolean value or an expression that evaluates to a boolean value.
• The then block and else block must be indented one level deeper than the if statement.

Summary

if then statement is used for decision making based on the result of a condition. It executes a specific code block if a condition is true and another code block if the condition is false. The condition must be a boolean value or an expression that evaluates to a boolean value. The syntax is if condition then expression1 else expression2.