stuart-d2
12/22/2014 - 9:26 PM

Call By Value : Value will be different within function and outside of function • IF we change something in the copied variable it will no

Call By Value :
Value will be different within function and outside of function • IF we change something in the copied variable it will not have an effect on the original variable. Use if You just want to pass in a value to a function, essentially just copying, with knowledge that inside the function and outside the function will be two different values eventhough they share the same variable name.

CallByValue.js
content_copyfile_download
/*A copy of the value 5 is being passed to the function.  No matter what the function 'f' does, x will be unaffected back in the calling routine.  */  


var x = 5;
.
.
..... f(x);

**********************************

function testfun(value) {
value = value + 100
console.log("New Value: - " + value);
}
var value = 100;
testfun(value);  
console.log('Outside of function: -  ' + value);

//OUTPUT
/*Copy sent into the testfun function. original value will be unchanged. */ 
New Value : - 200 
Outside of function: - 100