blocks|key|1410141|text|惯用的方法是这样写：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410142|"The+#{animal}+#{action}+the+#{second_animal}"|code-block|syntax|javascript|1410143|注意字符串两边的双引号(")：这是Ruby使用内置占位符替换的触发器。你不能用单引号(')替换它们，否则字符串将保持原样。|1410144|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The idiomatic way is to write something like this:

<pre><code>"The #{animal} #{action} the #{second_animal}"
</code></pre>

Note the double quotes (") surrounding the string: this is the trigger for Ruby to use its built-in placeholder substitution. You cannot replace them with single quotes (') or the string will be kept as is.

blocks|key|1410211|text|您可以使用类似sprintf的格式将值注入到字符串中。为此，字符串必须包含占位符。将参数放入数组中，并使用以下方法中的一种：(有关更多信息，请参阅the+documentation+for+Kernel::sprintf。)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1410212|fmt+=+'The+%25s+%25s+the+%25s'
res+=+fmt+%25+[animal,+action,+other_animal]++#+using+%25-operator
res+=+sprintf(fmt,+animal,+action,+other_animal)++#+call+Kernel.sprintf|code-block|syntax|javascript|1410213|您甚至可以显式指定参数编号并对其进行调整：|1410214|'The+%253$s+%252$s+the+%251$s'+%25+['cat',+'eats',+'mouse']|1410215|或者使用散列键指定参数：|1410216|'The+%25{animal}+%25{action}+the+%25{second_animal}'+%25
++{+:animal+=>+'cat',+:action=>+'eats',+:second_animal+=>+'mouse'}|1410217|请注意，必须为%25运算符的所有参数提供一个值。例如，您无法避免定义animal。|style|CODE|1410218|entityMap|0|LINK|mutability|MUTABLE|url|http://ruby-doc.org/core/classes/Kernel.html#M005984^0|21|11|0|0|0|0|0|0|0|7|1|W|6|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|F|7|16|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|17|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|18|8|@]|9|@]|C|$G|H]]|$1|M|3|N|5|6|7|19|8|@]|9|@]|C|$]]|$1|O|3|P|5|F|7|1A|8|@]|9|@]|C|$G|H]]|$1|Q|3|R|5|6|7|1B|8|@$A|1C|B|1D|S|T]|$A|1E|B|1F|S|T]]|9|@]|C|$]]|$1|U|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]]]

You can use sprintf-like formatting to inject values into the string. For that the string must include placeholders. Put your arguments into an array and use on of these ways:
(For more info look at <a href="http://ruby-doc.org/core/classes/Kernel.html#M005984" rel="noreferrer">the documentation for Kernel::sprintf</a>.)

<pre><code>fmt = 'The %s %s the %s'
res = fmt % [animal, action, other_animal] # using %-operator
res = sprintf(fmt, animal, action, other_animal) # call Kernel.sprintf
</code></pre>

You can even explicitly specify the argument number and shuffle them around:

<pre><code>'The %3$s %2$s the %1$s' % ['cat', 'eats', 'mouse']
</code></pre>

Or specify the argument using hash keys:

<pre><code>'The %{animal} %{action} the %{second_animal}' %
 { :animal =&gt; 'cat', :action=&gt; 'eats', :second_animal =&gt; 'mouse'}
</code></pre>

Note that you must provide a value for all arguments to the <code>%</code> operator. For instance, you cannot avoid defining <code>animal</code>.

blocks|key|1410239|text|["The",+animal,+action,+"the",+second_animal].join("+")|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1410240|是另一种方式。|unstyled|1410241|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>["The", animal, action, "the", second_animal].join(" ")
</code></pre>

is another way to do it.

blocks|key|1624968|text|标准的ERB模板系统可能适用于您的场景。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1624969|def+merge_into_string(animal,+second_animal,+action)
++template+=+'The+<%25=animal%25>+<%25=action%25>+the+<%25=second_animal%25>'
++ERB.new(template).result(binding)
end

merge_into_string('tiger',+'deer',+'eats')
=>+"The+tiger+eats+the+deer"

merge_into_string('bird',+'worm',+'finds')
=>+"The+bird+finds+the+worm"|code-block|syntax|javascript|1624970|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The standard ERB templating system may work for your scenario.

<pre><code>def merge_into_string(animal, second_animal, action)
 template = 'The &lt;%=animal%&gt; &lt;%=action%&gt; the &lt;%=second_animal%&gt;'
 ERB.new(template).result(binding)
end

merge_into_string('tiger', 'deer', 'eats')
=&gt; "The tiger eats the deer"

merge_into_string('bird', 'worm', 'finds')
=&gt; "The bird finds the worm"
</code></pre>

blocks|key|1410311|text|这就是所谓的字符串插值，你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1410312|"The+#{animal}+#{action}+the+#{second_animal}"|code-block|syntax|javascript|1410313|重要提示:只有当字符串包含在双引号(“")中时，它才会起作用。|1410314|无法按预期工作的代码示例：|1410315|'The+#{animal}+#{action}+the+#{second_animal}'|1410316|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

This is called string interpolation, and you do it like this:

<pre><code>"The #{animal} #{action} the #{second_animal}"
</code></pre>

Important: it will only work when string is inside double quotes (" ").

Example of code that will not work as you expect:

<pre><code>'The #{animal} #{action} the #{second_animal}'
</code></pre>

I'm looking for a better way to merge variables into a string, in Ruby.

For example if the string is something like:

"The <code>animal</code> <code>action</code> the <code>second_animal</code>"

And I have variables for <code>animal</code>, <code>action</code> and <code>second_animal</code>, what is the prefered way to put those variables in to the string?

Ruby: Merging variables in to a string

Kernel

我正在寻找一种用Ruby将变量合并成字符串的更好的方法。例如，如果字符串类似于："The animal action the second_animal“我有用于animal、action和second_animal的变量，将这些变量放入字符串的首选方法是什么？

问Ruby:将变量合并到字符串中
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