Lasso Programming: Lasso Language Reference

[ capture ]

Type

A capture is a block of Lasso code that can be passed to another method or invoked locally. Captures are context aware and depending on the scope have access to the current locals and self. Captures are denoted by { } brackets, by {^ ^} brackets, and are generated when using the "container" syntax. For example:

if (true)

something

/if

The above creates a capture between the if() /if.

Captures are a core component of the language and in many ways are transparent in typical usage.

Syntax
Methods
Traits

{ }
{^ ^}
foo();

/foo;

Examples

Beginner
Intermediate
Advanced

Captures are used transparently by container methods.

Here the code within the inline will be passed to the inline method as a capture.

Code

inline(-database='lasso_email',-table='smtp_queue',-show) 
      local(columns = column_names)
/inline
#columns

Result

staticarray(id, id_site, id_route, id_cache, mime_text, mime_recipients, mime_from, smtp_host, smtp_port, smtp_timeout,
smtp_username, smtp_password, smtp_ssl, queue_date, queue_status, queue_error, queue_number, queue_priority,
queue_retries, merge_array, merge_tokens, create_date)

A capture being passed the inline method.

Code

inline(-database='lasso_email',-table='smtp_queue',-show) => {
      local(columns = column_names)
}
#columns

Result

staticarray(id, id_site, id_route, id_cache, mime_text, mime_recipients, mime_from, smtp_host, smtp_port, smtp_timeout,
smtp_username, smtp_password, smtp_ssl, queue_date, queue_status, queue_error, queue_number, queue_priority,
queue_retries, merge_array, merge_tokens, create_date)

Invoke a capture block

Code

{ return 'hello' }->invoke

Result

hello

A counter implemented with a capture.

Code

local(i=1)
{  
   #i = #i + 1
   #i < 10 ? currentcapture->restart
}()

#i

Result

Related Entries

Related
Category

Related Methods

null

null->addTrait

null->ascopy

null->ascopydeep

null->escape_member

null->hasmethod

null->invoke

null->isa

null->lassoApp_include_current

null->listmethods

null->parent

null->settrait

null->trait

null->type

Related Types

null->array

null->boolean

null->bytes

null->capture

null->client_address

null->currency

null->custom

null->database_registry

null->dateandtime

null->decimal

null->delve

null->dir

null->dsinfo

null->duration

null->eacher

null->email_compose

null->email_smtp

null->email_stage_impl_base

null->file

null->generateForEachKeyed

null->generateForEachUnKeyed

null->generateSeries

null->inline_type

null->integer

null->java_jnienv

null->jfieldid

null->jfloat

null->jint

null->jmethodid

null->jobject

null->jshort

null->keyword

null->ldap

null->list

null->list_node

null->locale

null->magick_image

null->memberstream

null->mime_reader

null->net_tcp

null->net_udp

null->net_udppacket

null->null

null->opaque

null->pair

null->pair_compare

null->pairUp

null->pdf_typebase

null->percent

null->queriable_groupBy

null->queriable_grouping

null->queriable_groupJoin

null->queriable_join

null->queriable_orderBy

null->queriable_orderByDescending

null->queriable_select

null->queriable_selectMany

null->queriable_skip

null->queriable_take

null->queriable_thenBy

null->queriable_thenByDescending

null->queriable_where

null->Queue

null->regexp

null->repeat

null->security_registry

null->serialization_element

null->serialization_reader

null->serialization_writer

null->sourcefile

null->sqlite3

null->sqlite_db

null->sqlite_results

null->sqlite_table

null->staticarray

null->tag

null->tie

null->tree_base

null->tree_node

null->tree_nullNode

null->void

null->web_request

null->xml_DOMImplementation

null->xml_namedNodeMap

null->xml_node

null->xml_nodeList

null->xml_notation

null->zip

null->zip_file

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[ capture ]

Has methods:

Has traits:

Examples

Captures are used transparently by container methods.

A capture being passed the inline method.

Invoke a capture block

A counter implemented with a capture.

Related Entries

Related Methods

Related Types

Methods

Types

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