A function is a block of organized, reusable code that is used to perform a single, related action. Functions provide better modularity for your application and a high degree of code reusing.
Ideally, you should consider using the single responsibility principle (SOLID) which states that every module or function should have responsibility for a single part of the functionality provided by the software to keep your code maintainable.
Like C and Go, functions cannot be overloaded.
fn sum(x, y int)int{
return x + y
}
println(sum(77,33))
Note: The type comes after the argument's name.
fn full_name(first_name, last_name string)string{
return first_name +' '+ last_name
}
println(full_name("Vitor","Oliveira"))
Variadic Functions
Functions can also be variadic i.e. accept an infinite number of arguments. They are not arrays and cannot be returned.
fn foo(test ...string){
for txt in test {
println(txt)
}
}
foo("V","is","the","best","lang","ever")
Output
V
is
the
best
lang
ever
Multi-Return Functions
Similar to Go, functions in V can also return multiple and with a different type.
fn student(name string, age int)(string,int){
return name, age
}
name1, age1 :=student("Tom",15)
println(name1)
println(age1)
Output
Tom, 15
High Order Functions
Functions in V can also take in another function as a parameter which is usually needed for something like sort, map, filter, etc.
fn square(num int)int{
return num * num
}
fn run(value int, op fn(int)int)int{
returnop(value)
}
println(run(10, square))
Output
100
Exercises
1.
Write a V program to find the square of any number using the function.
2.
Write a V program to check a given number is even or odd using the function.
3.
Write a V program to convert decimal number to binary number using the function.
4.
Write a V program to check whether a number is a prime number or not using the function.
5.
Write a V program to get the largest element of an array using the function.