Number (Json function): Difference between revisions
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{{Template:Json:Number subtitle}} | {{Template:Json:Number subtitle}} | ||
This function creates a Json object of the number type. | |||
This | |||
==Syntax== | ==Syntax== | ||
{{Template:Json:Number syntax}} | {{Template:Json:Number syntax}} | ||
===Syntax terms=== | ===Syntax terms=== | ||
<table class="syntaxTable"> | <table class="syntaxTable"> | ||
<tr><th>%json</th><td><var>Json</var> object</td></tr> | <tr><th>%json</th><td>The <var>Json</var> object created by Number.</td></tr> | ||
<tr><th nowrap="true"><var>[%(Json):]</var></th> | <tr><th nowrap="true"><var>[%(Json):]</var></th> | ||
<td>The optional class name in parentheses denotes a [[Notation conventions for methods#Constructors|virtual constructor]] | <td>The optional class name in parentheses denotes a [[Notation conventions for methods#Constructors|virtual constructor]].</td></tr> | ||
<tr><th>number</th> | <tr><th>number</th> | ||
<td> | <td>The numeric value of the new Json object. This value can be returned by the [[NumberValue (Json function)|NumberValue function]].</td></tr> | ||
</table> | </table> | ||
==Usage notes== | ==Usage notes== | ||
<ul> | |||
<li>As with all virtual or true constructors, it is usually not necessary to specify the <code>%(json):</code> before the Number method. That is <code>%json = %(json):number(22)</code> is equivalent to <code>%json = number(22)</code>. And, because of [[Json class#Implicit conversions|implicit conversion]] it is not even necessary to specify the Number method so the previous could be written <code>%json = 22</code>.</li> | |||
<li>The Number method is probably most useful when its input value has a non-numeric type that is known to be convertible to a number.</li> | |||
</ul> | |||
==Examples== | ==Examples== | ||
The following example sets a Json object to a number retrieved from a global. This might be a common use case for the Number method as $getg always returns a string. | |||
<p class="code">b | |||
$setg('pi', $pi) | |||
end | |||
b | |||
%json is object json | |||
%json = number($pi) | |||
printText {~=%json} | |||
end | |||
</p> | |||
This prints: | |||
<p class="code">%json=3.14159265358979 | |||
</p> | |||
==See also== | ==See also== | ||
{{Template:Json:Number footer}} | {{Template:Json:Number footer}} | ||
Latest revision as of 21:45, 18 February 2015
Create a Number JSON object (Json class)
[Introduced in Model 204 7.6]
This function creates a Json object of the number type.
Syntax
%json = [%(Json):]Number( number)
Syntax terms
| %json | The Json object created by Number. |
|---|---|
| [%(Json):] | The optional class name in parentheses denotes a virtual constructor. |
| number | The numeric value of the new Json object. This value can be returned by the NumberValue function. |
Usage notes
- As with all virtual or true constructors, it is usually not necessary to specify the
%(json):before the Number method. That is%json = %(json):number(22)is equivalent to%json = number(22). And, because of implicit conversion it is not even necessary to specify the Number method so the previous could be written%json = 22. - The Number method is probably most useful when its input value has a non-numeric type that is known to be convertible to a number.
Examples
The following example sets a Json object to a number retrieved from a global. This might be a common use case for the Number method as $getg always returns a string.
b $setg('pi', $pi) end b %json is object json %json = number($pi) printText {~=%json} end
This prints:
%json=3.14159265358979