How to write an inline IF statement in JavaScript

Question

How can I use an inline if statement in JavaScript  Is there an inline else statement too   Something like this   var a   2  var b   3   if a  lt  b           do something

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To add to this you can also use inline if condition with  amp  amp  and    operators  Like this  var a   2  var b   0   var c    a  gt  b    b    0    do something     do something else

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inline if      hypothesis      truthy conclusion     falsey conclusion     truthy conclusion  statements executed when hypothesis is true  falsey conclusion  statements executed when hypothesis is false  your example   var c     a  lt  b     a lt b statements       a lt b  statements

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You can also approximate an if else using only Logical Operators    a  amp  amp  b     c   The above is roughly the same as saying   a   b   c   And of course  roughly the same as   if   a     b   else   c     I say roughly because there is one difference with this approach  in that you have to know that the value of b will evaluate as true  otherwise you will always get c  Bascially you have to realise that the part that would appear if      here   is now part of the condition that you place if   here          The above is possible due to JavaScripts behaviour of passing   returning one of the original values that formed the logical expression  which one depends on the type of operator  Certain other languages  like PHP  carry on the actual result of the operation i e  true or false  meaning the result is always true or false  e g   14  amp  amp  0              results as 0   not false 14    0              results as 14  not true 1  amp  amp  2  amp  amp  3  amp  amp  4     results as 4   not true true  amp  amp               results as           0             results as      One main benefit  compared with a normal if statement  is that the first two methods can operate on the righthand-side of an argument i e  as part of an assignment   d    a  amp  amp  b     c  d   a   b   c   if  a    true  then  d   b  else  d   c    The only way to achieve this with a standard if statement would be to duplicate the assigment   if   a     d   b   else   d   c     You may ask why use just Logical Operators instead of the Ternary Operator  for simple cases you probably wouldn t  unless you wanted to make sure a and b were both true  You can also achieve more streamlined complex conditions with the Logical operators  which can get quite messy using nested ternary operations    then again if you want your code to be easily readable  neither are really that intuative

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In plain English  the syntax explained   if condition       do something if condition is met    else      do something else if condition is not met      Can be written as   condition   do something if condition is met   do something else if condition is not met

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lt div id  ABLAHALAHOO  gt 8008 lt  div gt   lt div id  WABOOLAWADO  gt 1110 lt  div gt   parseInt       ABLAHALAHOO    text     gt  parseInt       WABOOLAWADO   text      alert   Eat potato      alert   You starve

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If you just want an inline IF  without the ELSE   you can use the logical AND operator    a  lt  b   amp  amp    your code      If you need an ELSE also  use the ternary operation that the other people suggested

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You don t necessarily need jQuery   JavaScript alone will do this   var a   2  var b   3      var c     a  lt  b     minor     major      The c variable will be minor if the value is true  and major if the value is false     This is known as a  Conditional  ternary  Operator   https   developer mozilla org en-US docs JavaScript Reference Operators Conditional Operator

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You could do like this in JavaScript   a  lt  b   passed     failed

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I often need to run more code per condition  by using          multiple code elements can execute   var a   2  var b   3  var c   0     a  lt  b      alert  hi    a 3  b 2  c a b       alert  by    a 4  b 10  c a b

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For writing if statement inline  the code inside of it should only be one statement   if   a  lt  b      code to be executed without curly braces

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Isn t the question essentially  can I write the following   if  foo    console log bar  else   console log foo   bar    the answer is  yes  the above will translate   however  be wary of doing the following  if  foo    if  bar      console log foo    else      console log bar  else    console log foobar    be sure to wrap ambiguous code in braces as the above will throw an exception  and similar permutations will produce undesired behaviour

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FYI  you can compose conditional operators  var a    truthy    1    falsy    2   3    If your logic is sufficiently complex  then you might consider using an IIFE  var a    function        if  truthy  return 1    else if  falsy  return 2    return 3          Of course  if you plan to use this logic more than once  then you aught to encapsulate it in a function to keep things nice and DRY

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There is a ternary operator  like this   var c    a  lt  b     a is less than b      a is not less than b

[javascript] How to write an inline IF statement in JavaScript?

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