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26 thg 12, 2022
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Cũng áp dụng cho ColdFusion
Description
This function loops over elements in a structure by accessing key-value pairs.
Returns
Void
Category
History
ColdFusion (2021 release): Introduced the following parameters:
- parallel
- maxThreadCount
Syntax
structEach(struct,function(key, value [, struct]){} [, parallel] [, maxThreads])
Parameters
|
|
Description |
|
struct |
Name of the structure object. |
|
function |
Inline function executed for each key - value pair in the struct. |
|
key |
Key in a struct. |
|
value |
Value in a struct. |
|
parallel |
(Boolean)- True if you want to enable parallel programming. |
|
maxThreads |
(Int) The number of threads the function can execute. The number of threads must be between 1-50. If the value exceeds 50, there is an exception. |
Example using an inline function
<cfscript>
myStruct=StructNew();
myStruct = {a:1,b=2,c=3,d=4,e=5}; // Define key-value pairs
// Run StructEach with an inline function
StructEach(myStruct,function(key,value) {
WriteOutput('The value of ' & key & ' is ' & value & '; ');
});
</cfscript>
Output
The value of a is 1; The value of b is 2; The value of c is 3; The value of d is 4; The value of e is 5;
Example using a named function
<cfscript>
myStruct=StructNew();
myStruct = {team:"Chicago Bulls",player:"Michael Jordan", sport:"basketball"}; // Define key-value pairs
// Create a named function that takes two arguments as key and value
function getValues(key, value) {
writeOutput('My favorite ' & key & ' is ' & value & " | ");
}
// Run StructEach with the named function getValues
structEach(myStruct,getValues);
</cfscript>
Output
My favorite player is Michael Jordan | My favorite sport is basketball | My favorite team is Chicago Bulls |
Using member function
<cfscript>
myStruct = {a:1,b=2,c=3,d=4,e=5}; // Define key-value pairs
myStruct.each(function(key,value){
WriteOutput("#key#:#value#");
});
</cfscript>
Using parallelization
<cfscript>
mystruct= Structnew("ordered");
for(i=1;i<=10000;i++){
mystruct.insert("key#i#","val#i#")
}
function callback(key,val){
writeoutput(key & " " & val & "<br>")
}
t_start=GetTickCount()
mystruct.each(callback)
t_end=GetTickCount()
writeoutput("<br>Time taken with no parallel:" & t_end-t_start)
t_start=GetTickCount()
mystruct.each(callback,true,5);
t_end=GetTickCount()
writeoutput("<br>Time taken with 5 threads:" & t_end-t_start)
t_start=GetTickCount()
mystruct.each(callback,true,10)
t_end=GetTickCount()
writeoutput("<br>Time taken with 10 threads:" & t_end-t_start)
t_start=GetTickCount()
structeach(struct=mystruct,callback=callback,parallel=true,maxthreadcount=20)
t_end=GetTickCount()
writeoutput("<br>Time taken with 20 threads:" & t_end-t_start)
t_start=GetTickCount()
structeach(struct=mystruct,callback=callback,parallel=true,maxthreadcount=40)
t_end=GetTickCount()
writeoutput("<br>Time taken with 40 threads:" & t_end-t_start)
</cfscript>
