Up to now we have write out code line by line. But there is problem with that. What will we do if the same 3 line code should be used in different 120 places. Here functions come to play. Functions a block of code that can be used just with single line.
function sum(a,b){
return a+b;
}
s1=sum(1,2);
s=1sum(4,5);
s2=sum(10,20);
- function is the keyword used to specify function
- sum is the name of the function and will be used to call function
- (a,b) specifies parameters of the function. Parameter is input value for functions.
- return is keyword used to give back new value to the function callers. s1,s2,s3 is assigned to the values calculated by function.
- s1 is assigned value which is calculated by sum function with values 1,2 . s1 will hold sum of 1 and 2 which is 3
Function do not have to return a value. So following function is valid too
function slogan(){
console.log("Hello Poftut")
}
- slogan function do not have any parameters because it do not need. Also this function do not return a value just prints to console