Today I was looking into new functions added ColdFusion 10
and I found two interesting functions. So, I thought to share those functions.
-
ArrayEach()
-
StructEach()
1.
ArrayEach(array, HandlerFunction( Any
currentObj){})
“ArrayEach” is used to loop over an array object and the
Handle Function can have each element of the
array during looping. So, we can apply our business logic in side the
handler function. We can write the handler function as inline function or a named
function which we can reuse in multiple cases.
Lets see the example:
<cfscript>
dispObj = new Display();
arr = [1,2,3,4,5,6,7,8,9,10];
WriteDump(arr);
function showArrayElement( elem ) {
Writeoutput(elem
& '<br>');
}
//Calling an inline
function during loop over an array
arrayEach(arr,
function(currentObj) { Writeoutput( currentObj & '<br/>' ); });
//Calling a named function during looping over the array
arrayEach(arr,
showArrayElement);
//Calling a named function by object during looping over the array
arrayEach(arr, dispObj.showArrayElem);
</cfscript>
After running the above code I got the following output.
2. StructEach(
structure, HandlerFunction( key, value )
{})
Similarly like AyyayEach() here we can loop over a structure
elements where the handle function have the key and value. Using the handler
function we can implement our business logic.
Lets see the code:
<cfscript>
dispObj = new Display();
struct = {name: "Upendra", place: "Hyderabad",
technology: "coldfusion", time: "12:53PM"};
Writedump(struct);
function showStructElement(key, value) {
Writeoutput(
key & ':' & value & '<br/>' );
}
//Calling an inline
function while looping over the struct
structEach( struct,
function(key, value) { Writeoutput( key & ':' & value & '<br/>' ); } );
//Calling a named function during looping over a structure
structEach( struct,
showStructElement );
//Calling a named function by object during looping over a
structure
structEach( struct,
dispObj.showStructElement );
</cfscript>
After running above code we will get the following output:
***NOTE: In the output I have not displayed the result of named function call by creating object of a component as it would produce same result as general named function call.
Display.cfc
component
output="true"{
function
showArrayElem( elem) {
Writeoutput(elem
& '<br>');
}
function
showStructElement(key, value) {
Writeoutput(
key & ':' & value & '<br/>' );
}
}
