變更
Many new pages use this template, so it's not really sufficient to provide an exact number - it's better to approximate so that it needs to be updated less frequently
{{High-risk|860over 15,600,000+pages, which is {{#expr:(1560000000/{{NUMBEROFPAGES:R}}) round 0}}% of all}}{{used in system}}
{{Module rating|protected}}
This module provides a consistent interface for processing boolean or boolean-style string input. While Lua allows the <code>true</code> and <code>false</code> boolean values, wikicode templates can only express boolean values through strings such as "yes", "no", etc. This module processes these kinds of strings and turns them into boolean input for Lua to process. It also returns <code>nil</code> values as <code>nil</code>, to allow for distinctions between <code>nil</code> and <code>false</code>. The module also accepts other Lua structures as input, i.e. booleans, numbers, tables, and functions. If it is passed input that it does not recognise as boolean or <code>nil</code>, it is possible to specify a default value to return.
<code>value</code> is the value to be tested. Boolean input or boolean-style input (see below) always evaluates to either <code>true</code> or <code>false</code>, and <code>nil</code> always evaluates to <code>nil</code>. Other values evaluate to <code>default</code>.
== 用法 Usage ==
First, load the module. Note that it can only be loaded from other Lua modules, not from normal wiki pages. For normal wiki pages you can use {{tl|yesno}} instead.
<source lang="lua">
-- 當參數是"yes"或其等效字串時將回傳"真"These always return true:
yesno('yes')
yesno('y')
yesno('true')
yesno('t')
yesno('1')
yesno(1)
yesno(true)
-- 當參數是"no"或其等效字串時將回傳"假"These always return false:
yesno('no')
yesno('n')
yesno('false')
yesno('f')
yesno('0')
yesno(0)
yesno(false)
-- 當參數是nil時將回傳nilA nil value always returns nil:
yesno(nil)
</source>
<source lang="lua">
</source>
Although the blank string usually evaluates to false in wikitext, it evaluates to true in Lua. This module prefers the Lua behaviour over the wikitext behaviour. If treating the blank string as false is important for your module, you will need to remove blank arguments at an earlier stage of processing.<includeonly>{{#ifeq:{{SUBPAGENAME}}|sandbox||[[Category:Lua metamodules]]}}</includeonly>