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On this page
  • Method Signature
  • Arguments
  • Examples
  • structEach() with an inline function (closure)
  • Using a function reference
  • Using the member function
  • Accessing a reference to the looping struct in the callback
  • Additional Examples
  • Related

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  1. BoxLang Language
  2. Reference
  3. Built-in Functions
  4. struct

StructEach

PreviousStructDeleteNextStructEquals

Last updated 17 days ago

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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

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

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

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

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

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

Run Example
Run Example
Run Example
Run Example
Run Example
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