Using OR operator in a jquery if statement

Question

I need to use the OR operator in a jQuery if statement to filter out 10 states  My code works wile only excluding one state  but fails when i try to include multiple states  Is there a correct way to do this   Code I am am using     if   state    10      state    15      state    19           state    22      state    33      state    39           state    47      state    48      state    49           state    51       return true    Thanks

User · Answer

The code you wrote will always return true because state cannot be both 10 and 15 for the statement to be false  if   state    10   amp  amp   state    15      AND is what you need not OR   Use   inArray instead  This returns the index of the element in the array   JSFIDDLE DEMO  var statesArray    10  15  19      list out all  var index     inArray state  statesArray    if index    -1        console log  Not there in array        return true     else       console log  Found it        return false

User · Answer

Think about what  if   state    10      state    15      state    19      state    22      state    33      state    39      state    47      state    48      state    49      state    51     means     means  or   The negation of this is  by DeMorgan s Laws    state    10  amp  amp  state    15  amp  amp  state    19      In other words  the only way that this could be false if if a state equals 10  15  and 19  and the rest of the numbers in your or statement  at the same time  which is impossible   Thus  this statement will always be true  State 15 will never equal state 10  for example  so it s always true that state will either not equal 10 or not equal 15   Change    to  amp  amp    Also  in most languages  the following   if  x      return true    else     return false      is not necessary  In this case  the method returns true exactly when x is true and false exactly when x is false  You can just do   return x

User · Answer

Update  using  indexOf   to detect if stat value is one of arr elements  Pure JavaScript   x000D   x000D  var arr    20 30 40 50 60 70 80 90 100   x000D    or detect equal to all x000D    var arr    10 10 10 10 10 10 10   x000D      var stat   10  x000D   x000D  if arr indexOf stat   -1 alert  stat is not equal to one more elements of array    x000D   x000D   x000D

User · Answer

The logical OR      automatically short circuits if it meets a true condition once   false    false    true    false   true  stops at second condition   On the other hand  the logical AND   amp  amp   automatically short circuits if it meets a false condition once   false  amp  amp  true  amp  amp  true  amp  amp  true   false  stops at first condition

[jquery] Using OR operator in a jquery if statement

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