StackOverflow2013

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plurals

PO
primarykey
Id
12604314
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
1
CommunityOwnedDate
CreationDate
2012-09-26T14:42:42.483
FavoriteCount
0
LastActivityDate
2012-09-26T14:56:26.430
LastEditDate
2017-05-23T11:51:57.217
LastEditorUserId
-1
OwnerUserId
405017
ParentId
12604034
PostTypeId
2
Score
14
ViewCount
0
LastEditorDisplayName
text
Body
Ruby is a <a href="https://stackoverflow.com/questions/3462405/terminology-what-features-must-a-language-have-for-it-to-be-considered-a-dynami">dynamically-typed</a>, <a href="https://stackoverflow.com/questions/805168/what-is-a-strictly-typed-language">strictly-typed</a> (or "strongly-typed") language. Lua is another such language. The former means that variables can hold any class of value. The latter—what you are running into—means that type coercion does not happen automatically. Contrast these with JavaScript, which is dynamically-typed and loosely-typed. In JavaScript you can write <code>var x = [] + false;</code> and it will attempt to do something helpful. For another example, in JavaScript <code>"1" + 1 == "11"</code> but <code>"1" - 1 == 0</code>. Ruby will not do any such thing. In your case you need: <pre><code>puts income.to_i - bills.to_i </code></pre> <hr> Note that—because most <a href="http://phrogz.net/ProgrammingRuby/language.html#operatorexpressions" rel="nofollow noreferrer">operators are implemented as methods</a> in Ruby—each class can choose how the operator handles operands of various types. For example: <pre><code>class Person def +( something ) if something.is_a?(Numeric) self.weight += something elsif something.is_a?(Time) self.age += something else raise "I don't know how to add a #{something.class} to a Person." end end end </code></pre> Most of the time the core libraries do not attempt to be so clever, however.
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1. POUndefined method `-' for "100":String
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1. PTAnswer
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1. USCommunity
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1. USPhrogz
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1. POUndefined method `-' for "100":String
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1. COMuch better than my answer! Thanks, Phrogz.
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