StructEach

Used to iterate over a struct and run the function closure for each key/value pair.

Method Signature

StructEach(struct=[structloose], callback=[function:BiConsumer], parallel=[boolean], maxThreads=[integer], ordered=[boolean])

Arguments

Argument	Type	Required	Description	Default
struct	struct	true	The target struct to iterate
callback	function:BiConsumer	true	The function to invoke for each item. The function will be passed 3 arguments: the key, the value, the struct. You can alternatively pass a Java BiConsumer which will only receive the first 2 args.
parallel	boolean	false	Specifies whether the items can be executed in parallel	false
maxThreads	integer	false	The maximum number of threads to use when parallel = true
ordered	boolean	false	(BoxLang only) whether parallel operations should execute and maintain order	false

Examples

structEach() with an inline function (closure)

Use a function to write out the keys in a structure to the screen

Run Example

someStruct = { 
	A : 1,
	B : 2,
	C : 3
};
structEach( someStruct, ( Any key, Any value ) => {
	writeOutput( "Key " & key & " is " & value & "; " );
} );

Result: Key a is 1; Key b is 2; Key c is 3;

Using a function reference

Run Example

favs = { 
	COLOR : "blue",
	FOOD : "pizza",
	SPORT : "basketball"
};

// named function
// notice that the function takes two arguments, the key and value pair of the current iteration of the structure's key-value pairs
function getFavorites( Any key, Any value ) {
	writeOutput( "My favorite " & key & " is " & value );
}
// run structEach() with a named function
structEach( favs, getFavorites );
// run structEach() with an inline function
structEach( favs, ( Any key, Any value ) => {
	writeOutput( "My favorite " & key & " is " & value );
} );

Using the member function

Run Example

statusCodes = { 
	OK : 200,
	CREATED : 201,
	NOT_MODIFIED : 304,
	BAD_REQUEST : 400,
	NOT_FOUND : 404
};
statusCodes.each( ( Any key, Any value ) => {
	writeOutput( "#key# => #value#<br />" );
} );

Result: NOT_FOUND => 404 BAD_REQUEST => 400 CREATED => 201 OK => 200 NOT_MODIFIED => 304

Accessing a reference to the looping struct in the callback

Run Example

statusCodes = { 
	OK : 200,
	CREATED : 201,
	NOT_MODIFIED : 304,
	BAD_REQUEST : 400,
	NOT_FOUND : 404
};
statusCodes.each( ( Any key, Any value, Any struct ) => {
	writeDump( struct );
} );

Additional Examples

Run Example

animals = { 
	COW : "moo",
	PIG : "oink",
	CAT : "meow"
};
StructEach( animals, ( Any key ) => {
	// Show key 'arguments.key'
	Dump( label="Key", var=arguments.KEY );
	// Show key's value 'animals[arguments.key]'
	Dump( label=arguments.KEY & "'s value", var=animals[ arguments.KEY ] );
} );

Related

• StructEquals

• StructReduce

• StructIsCaseSensitive

• StructNew

• StructGet

• StructDelete

• StructFilter

• StructIsOrdered

• StructSort

• StructToQueryString

• StructUpdate

• StructClear

• StructGetMetadata

• StructKeyArray

• StructToSorted

• StructCopy

• StructFindKey

• StructInsert

• StructMap

• StructFindValue

• StructValueArray

• StructSome

• StructKeyExists

• StructKeyTranslate

• StructEvery

• StructFind

• StructKeyList

• StructAppend