JavaScript single line if statement - best syntax this alternative

Question

It s been clearly put  although opinion none the less  that forgoing curly brackets on a single line if statement is not ideal for maintainability and readability   But what about this   if  lemons    document write  foo gave me a bar        It s even more compressed  and if expanded  the curly brackets won t be forgotten  Are there any blatant problems  and if not  what are the considerations  I feel like it s still very readable  at least as much as a ternary operator anyway  It seems to me like ternary operators aren t suggested as much due to readability  although I feel like that that conclusion isn t quite as unanimous   The evil twin in me wants to suggest this  although the syntax obviously isn t meant for it  and is probably just a bad idea    syntax    document write  My evil twin emerges

User · Answer

It can also be done using a single line with while loops and if like this   if  blah      doThis      It also works with while loops

User · Answer

I use it like this    lemons    alert  please give me a lemonade     alert  then give me a beer

User · Answer

Example in arrow functions   let somethingTrue   true  1 2 3 4 5  map i  gt somethingTrue  amp  amp  i 2    In promises   Promise resolve      then    gt checkTrueFalse  amp  amp  asyncFunc       then    gt           Otherwise   if somethingTrue  thenDo     If it s just a simple conditional  I prefer using if value  whenever possible because the word if in the beginning of the statement says more about what s happening than paranthesis and questionmarks

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Old Method    if x      add x     New Method  x  amp  amp  add x     Even assign operation also we can do with round brackets  exp includes  regexp replace    amp  amp   exp   exp replace    g     amp

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Another simple example   var a   11   a    10   alert  true     alert  false

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As has already been stated  you can use    amp  amp  style  lemons  amp  amp  document write  foo gave me a bar        or   bracket-less style  if  lemons  document write  foo gave me a bar      short-circuit return  If  however  you wish to use the one line if statement to short-circuit a function though  you d need to go with the bracket-less version like so   if  lemons  return  foo gave me a bar     as   lemons  amp  amp  return  foo gave me a bar      does not work    will give you a SyntaxError  Unexpected keyword  return

User · Answer

I ve seen many answers with many votes advocating using the ternary operator  The ternary is great if a  you do have an alternative option and b  you are returning a fairly simple value from a simple condition   But     The original question didn t have an alternative  and the ternary operator with only a single  real  branch forces you to return a confected answer   lemons    foo gave me a bar     who knows what you ll get back   I think the most common variation is lemons    foo           and  as you ll know from reading the myriad of articles for any language on true  false  truthy  falsey  null  nil  blank  empty  with our without      you are entering a minefield  albeit a well documented minefield    As soon as any part of the ternary gets complicated you are better off with a more explicit form of conditional   A long way to say that I am voting for if  lemons   foo

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This one line is much cleaner   if dog  alert  bark bark      I prefer this  hope it helps someone

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can use this  lemons   alert  quot please give me a lemonade quot     alert  quot then give me a beer quot     explanation  if lemons is true then alert  quot please give me a lemonade quot    if not  alert  quot then give me a beer quot

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You could use this format  which is commonly used in PHP    lemon    document write  foo gave me a bar     document write  if condition is FALSE

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i     0    quot true quot     quot false quot

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I ve seen the short-circuiting behaviour of the  amp  amp  operator used to achieve this  although people who are not accustomed to this may find it hard to read or even call it an anti-pattern   lemons  amp  amp  document write  foo gave me a bar        Personally  I ll often use single-line if without brackets  like this   if  lemons  document write  foo gave me a bar      If I need to add more statements in  I ll put the statements on the next line and add brackets  Since my IDE does automatic indentation  the maintainability objections to this practice are moot

User · Answer

As a lot of people have said  if you re looking for an actual 1 line if then       if  Boolean expression  do something      is preferred  However  if you re looking to do an if else then ternary is your friend  and also super cool         Boolean expression    do somethingForTrue     do somethingForFalse      ALSO       var something    Boolean expression    trueValueHardware   falseATRON    However  I saw one very cool example  Shouts to  Peter-Oslson for  amp  amp        Boolean expression   amp  amp  do something      Lastly  it s not an if statement but executing things in a loop with either a map reduce or Promise resolve   is fun too  Shouts to  brunettdan

[javascript] JavaScript single line 'if' statement - best syntax, this alternative?

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