StackOverflow2013

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plurals

PO
primarykey
Id
15465531
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-03-17T20:02:44.480
FavoriteCount
0
LastActivityDate
2013-03-17T22:03:07.060
LastEditDate
2013-03-17T22:03:07.060
LastEditorUserId
2767755
OwnerUserId
2767755
ParentId
15465421
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
see here <pre><code>2 and 7 #=> 7 2 or 7 #=> 2 2 or 7 and 12 #=> 12 2 or 7 or 12 #=> 2 2 or 7 and 12 or 10 #=> 12 true and true and false #=> false true or true or false #=> true true and true or false #=> true true or true and false #=> false true or true and false and true #=> false </code></pre> Summary : (a) when you will use in an expression with only <code>and</code> operator value of the expression is always the last operand and the reverse is true for expression having only <code>or</code> operator.In case of Boolean the full expression will be evaluated. (b) When an expression will have <code>and</code> and <code>or</code> mixed, evaluation will continue till the last <code>and</code> and its <code>ROH</code> operand will be the value of the expression(in case of <code>Boolean</code> last <code>and</code> RHO,LHO will be evaluated,after that result will be produced as Boolean operation rule. Applying the rule of (b) below code works: <pre><code>if true or true and false then puts "Quux" end #=> nil a = true or true and false #=> false if a then puts "Foo" end #Foo #=> nil </code></pre> Below code outputs <code>Foo</code> due to the precedence of <code>=</code> over <code>and</code>,<code>or</code>. The expression <code>a = true or true and false</code> evaluates as follows applying the rule (b) <pre><code>a = true or true and false || (a = true) or true and false || true and false || false </code></pre> One more good application of rule (b) <pre><code>if 2 and 3 or nil p "hi" end #=> "hi" if 2 or 3 and nil p "hello" end #nothing printed </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. PORuby boolean operator precedence, different behaviours
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USArup Rakshit
UserOwnerUserId
1. USArup Rakshit
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

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