blocks|key|631960|text|创建散列：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|631961|hash+=+{:item1+=>+1}|code-block|syntax|javascript|631962|向其中添加一个新项目：|631963|hash[:item2]+=+2|631964|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Create the hash:

<pre><code>hash = {:item1 =&gt; 1}
</code></pre>

Add a new item to it:

<pre><code>hash[:item2] = 2
</code></pre>

blocks|key|416827|text|它就像这样简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|416828|irb(main):001:0>+hash+=+{:item1+=>+1}
=>+{:item1=>1}
irb(main):002:0>+hash[:item2]+=+2
=>+2
irb(main):003:0>+hash
=>+{:item1=>1,+:item2=>2}|code-block|syntax|javascript|416829|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|$]]

It's as simple as:

<pre><code>irb(main):001:0&gt; hash = {:item1 =&gt; 1}
=&gt; {:item1=&gt;1}
irb(main):002:0&gt; hash[:item2] = 2
=&gt; 2
irb(main):003:0&gt; hash
=&gt; {:item1=&gt;1, :item2=&gt;2}
</code></pre>

blocks|key|416882|text|hashkey=value将value给出的值与key给出的键关联起来。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|416883|hash[:newKey]+=+"newValue"|code-block|syntax|javascript|416884|来自Ruby文档：http://www.tutorialspoint.com/ruby/ruby_hashes.htm|offset|length|416885|entityMap|0|LINK|mutability|MUTABLE|url|http://www.tutorialspoint.com/ruby/ruby_hashes.htm^0|0|0|9|1E|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

hash[key]=value
Associates the value given by value with the key given by key.

<pre><code>hash[:newKey] = "newValue"
</code></pre>

From Ruby documentation:
<a href="http://www.tutorialspoint.com/ruby/ruby_hashes.htm" rel="noreferrer">http://www.tutorialspoint.com/ruby/ruby_hashes.htm</a>

blocks|key|416966|text|如果要从另一个哈希添加新项-请使用merge方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|416967|hash+=+{:item1+=>+1}
another_hash+=+{:item2+=>+2,+:item3+=>+3}
hash.merge(another_hash)+#+{:item1=>1,+:item2=>2,+:item3=>3}|code-block|syntax|javascript|416968|在您的特定情况下，它可能是：|416969|hash+=+{:item1+=>+1}
hash.merge({:item2+=>+2})+#+{:item1=>1,+:item2=>2}|416970|但是，在应该添加多一个元素的时候使用它是不明智的。|416971|请注意，merge会将这些值替换为现有的键：|416972|hash+=+{:item1+=>+1}
hash.merge({:item1+=>+2})+#+{:item1=>2}|416973|就像hash[:item1]+=+2一样|416974|此外，您还应该注意，merge方法(当然)不会影响散列变量的原始值-它会返回一个新的合并后的散列。如果您想替换散列变量的值，请改用merge!：|416975|hash+=+{:item1+=>+1}
hash.merge!({:item2+=>+2})
#+now+hash+==+{:item1=>1,+:item2=>2}|416976|entityMap^0|H|5|0|0|0|0|0|4|5|0|0|2|G|0|A|5|1T|6|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|18|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|S|3|T|5|H|7|1C|8|@]|D|@]|E|$I|J]]|$1|U|3|V|5|6|7|1D|8|@$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|W|3|X|5|6|7|1G|8|@$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]]|D|@]|E|$]]|$1|Y|3|Z|5|H|7|1L|8|@]|D|@]|E|$I|J]]|$1|10|3|-4|5|6|7|1M|8|@]|D|@]|E|$]]]|11|$]]

If you want to add new items from another hash - use <code>merge</code> method:

<pre><code>hash = {:item1 =&gt; 1}
another_hash = {:item2 =&gt; 2, :item3 =&gt; 3}
hash.merge(another_hash) # {:item1=&gt;1, :item2=&gt;2, :item3=&gt;3}
</code></pre>

In your specific case it could be:

<pre><code>hash = {:item1 =&gt; 1}
hash.merge({:item2 =&gt; 2}) # {:item1=&gt;1, :item2=&gt;2}
</code></pre>

but it's not wise to use it when you should to add just one element more.

Pay attention that <code>merge</code> will replace the values with the existing keys:

<pre><code>hash = {:item1 =&gt; 1}
hash.merge({:item1 =&gt; 2}) # {:item1=&gt;2}
</code></pre>

exactly like <code>hash[:item1] = 2</code>

Also you should pay attention that <code>merge</code> method (of course) doesn't effect the original value of hash variable - it returns a new merged hash. If you want to replace the value of the hash variable then use <code>merge!</code> instead:

<pre><code>hash = {:item1 =&gt; 1}
hash.merge!({:item2 =&gt; 2})
# now hash == {:item1=&gt;1, :item2=&gt;2}
</code></pre>

blocks|key|632157|text|将哈希创建为：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|632158|h+=+Hash.new
=>+{}|code-block|syntax|javascript|632159|现在在哈希表中插入如下内容：|632160|h+=+Hash["one"+=>+1]|632161|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Create hash as:

<pre><code>h = Hash.new
=&gt; {}
</code></pre>

Now insert into hash as:

<pre><code>h = Hash["one" =&gt; 1]
</code></pre>

blocks|key|632176|text|hash_items+=+{:item+=>+1}
puts+hash_items+
#hash_items+will+give+you+{:item+=>+1}

hash_items.merge!({:item+=>+2})
puts+hash_items+
#hash_items+will+give+you+{:item+=>+1,+:item+=>+2}

hash_items.merge({:item+=>+2})
puts+hash_items+
#hash_items+will+give+you+{:item+=>+1,+:item+=>+2},+but+the+original+variable+will+be+the+same+old+one.+|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|632177|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>hash_items = {:item =&gt; 1}
puts hash_items 
#hash_items will give you {:item =&gt; 1}

hash_items.merge!({:item =&gt; 2})
puts hash_items 
#hash_items will give you {:item =&gt; 1, :item =&gt; 2}

hash_items.merge({:item =&gt; 2})
puts hash_items 
#hash_items will give you {:item =&gt; 1, :item =&gt; 2}, but the original variable will be the same old one. 
</code></pre>

I'm new to Ruby and don't know how to add new item to already existing hash. For example, first I construct hash:

<pre><code>hash = {item1: 1}
</code></pre>

after that a want to add item2 so after this I have hash like this:

<pre><code>{item1: 1, item2: 2}
</code></pre>

I don't know what method to do on hash, could someone help me?

How to add new item to hash

我是Ruby的新手，不知道如何在已经存在的哈希表中添加新的条目。例如，首先我构造hash：hash = {item1: 1}在那之后，我想要添加item2，所以在这之后，我有这样的散列：{item1: 1, item2: 2}我不知道如何处理hash，有人能帮我吗？

问如何向哈希中添加新项
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