Ternary operation in CoffeeScript

Question

I need to set value to a that depends on a condition   What is the shortest way to do this with CoffeeScript   E g  this is how I d do it in JavaScript   a   true    5   10      gt  a   5 a   false   5   10      gt  a   10

User · Answer

In almost any language this should work instead   a   true   amp  amp  5    10 a   false  amp  amp  5    10

User · Answer

CoffeeScript has no ternary operator  That s what the docs say   You can still use a syntax like  a   true then 5 else 10   It s way much clearer

User · Answer

Coffeescript doesn t support javascript ternary operator  Here is the reason from the coffeescript author      I love ternary operators just as much as the next guy  probably a bit   more  actually   but the syntax isn t what makes them good -- they re   great because they can fit an if else on a single line as an   expression       Their syntax is just another bit of mystifying magic to memorize  with   no analogue to anything else in the language  The result being equal    I d much rather have if elses always look the same  and always be   compiled into an expression        So  in CoffeeScript  even multi-line ifs will compile into ternaries   when appropriate  as will if statements without an else clause   if sunny      go outside    else      read a book     if sunny then go outside   else read a book         Both become ternaries  both can be used as expressions  It s consistent  and there s no new syntax to learn  So  thanks for the suggestion  but I m closing this   ticket as  wontfix     Please refer to the github issue  https   github com jashkenas coffeescript issues 11 issuecomment-97802

User · Answer

Since everything is an expression  and thus results in a value  you can just use if else   a   if true then 5 else 10 a   if false then 5 else 10   You can see more about expression examples here

User · Answer

a   if true then 5 else 10 a   if false then 5 else 10    See documentation

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Multiline version  e g  if you need to add comment after each line    a   if b   a depends on b then 5     b is true  else 10    b is false

User · Answer

You may also write it in two statements if it mostly is true use   a   5 a   10 if false   Or use a switch statement if you need more possibilities   a   switch x   when true then 5   when false then 10   With a boolean it may be oversized but i find it very readable

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