Currently, Javascript language is not strangers for programmers . Today , I would like to introduce management parameters passed to a function in the javascript language . Unlike languages such as C , C + + , Java … then the variable declaration should be cleared and the parameter passed to a function is fixed , if you want to pass the parameters more or less to the function defined before that it is impossible ( just as you can use methology like overloading in function) . So what is the difference ?
Javascript manage the parameters passed to the function through an array named arguments this is a global array.
For example :
I declare a function as follows
function reciveArgument( ) {
/ / this function will return parameters that you passed
return arguments ;
}
and when I call this function with different parameters as following :
console.log ( reciveArgument ( ” Parameter 1 ” , ” Parameter 2 ” , ” Parameter 3 ” ) ) ;
when you open up your console in your browser and see
>>>[“Parameter 1”, “Parameter 2”, “Parameter 3”]
Try passing by numbers
console.log ( reciveArgument ( 1,2,3 ) ) ;
The results returned as following:
>>[1, 2, 3]
So the arguments array is available in the function we do not need to care about overload function . For example, you write function sum ( ) of natural numbers , then just do a shoulder operation as follows :
function sum( ) {
var total = 0 ;
for ( var i in arguments) {
total + = arguments [ i ] ;
}
return total;
}
and you call this function again with different parameters
console.log ( sum ( 1,2,3 ) ) ;
console.log ( sum ( 1,2,3,4,5 ) ) ;
The results returned as following:
6
15
When you research the JavaScript language , you will find more interesting things . Thank you
