Lambda Expressions

Lambda expressions is an anonymous function used to transform data and create shorter representations of normal function as delegates. In c# we use => operator to transform data. This subject is strongly related to delegates, I suggest you reading the delegates post first. Let’s take a look at syntax:

(input parameters) => expression or statement block

We pass lambda expressions as arguments of functions.

Now lets create an example of same function with standard syntax and lambda expression.

static bool LessThanTen(int number)
{
return n<10;
}

This function takes an integer value and returns true if the value is lower than 10.

We can declare this method as a delegate

delegate bool del(int n);
static void Main(string[] args)
{
    del LessThanTem = n => n<10;
    bool j = LessThanTen(5); //j = true
}

In this example we can see simple construction lambda expression syntax.

We can also pass the same function as a parameter in other function.

Static void PrintResut(number, del newDel){
if(newDel(number))
Console.Writeline("condition is true")

else if(!newDel(number))
Console.Writeline("condition is false")
}

This construction allows us to pass different methods to the functions. Lets call one of them

PrintResult( 5, n => n < 10);

the result of this method is :

"condition is true"

This was just a brief introduction to idea of lambda expressions, in next post I’ll cover topic of expression trees. Stay Awesome!

Author: indiedevart

Indie Games Developer

2 thoughts on “Lambda Expressions”

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