JavaScript equivalent of PHP s die

Question

Is there something like  die  in JavaScript  I ve tried with  break   but doesn t work

User · Answer

You can use return false  This will terminate your script

User · Answer

It is possible to roll your own version of PHP s die   function die msg        throw msg     function test arg1        arg1   arg1    die  arg1 is missing        test      JSFiddle Example

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Just call die   without ever defining it   Your script will crash      When I do this  I usually call discombobulate   instead  but the principle is the same    Actually  what this does is throw a ReferenceError  making it roughly the same as spudly s answer - but it s shorter to type  for debugging purposes

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use firebug and the glorious     debugger    and never let the debugger make any step forward  Cleaner than throwing a proper Error  innit

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There is no function exit equivalent to php die   in JS   if you are not using any function then you can simply use return   return

User · Answer

There s no exact equaliant of language construct die of PHP in Javascript  die in PHP is pretty much equal to System exit   in Java  which terminates the current script and calls shutdown hooks   As some users suggested  throw Error can be used in some cases  however it never guarantees the termination of the current script   There can be always an exception handling block surrounding your throw statement- unless you call it on the top most level script block  which eventually exits only the script block you re executing   However it won t prevent the second block from being executed here  prints hello     lt script type  text javascript  gt    throw new Error  test     lt  script gt   lt script type  text javascript  gt    document write  hello     lt  script gt

User · Answer

You can only break a block scope if you label it  For example   myBlock      var a   0    break myBlock    a   1     this is never run    a     0    You cannot break a block scope from within a function in the scope  This means you can t do stuff like   foo       this doesn t work    function         break foo              You can do something similar though with functions   function myFunction    myFunction        you can now use break myFunction  instead of return

User · Answer

You can simply use the return  example     document  ready function              alert 1           return          alert 2           alert 3           alert 4         The return will return to the main caller function test1    and continue from there to test3      lt  DOCTYPE html PUBLIC  -  W3C  DTD XHTML 1 0 Transitional  EN   http   www w3 org TR xhtml1 DTD xhtml1-transitional dtd  gt   lt html xmlns  http   www w3 org 1999 xhtml  dir  ltr  lang  en  gt   lt head gt       lt meta http-equiv  Content-Type  content  text html  charset UTF-8    gt   lt  head gt   lt body gt   lt script type  text javascript  gt  function test1        test2        test3       function test2        alert 2       return      test4        test5       function test3        alert 3      function test4        alert 4      function test5        alert 5     test1      lt  script gt   lt  body gt   lt  html gt    but if you just add  throw     this will completely stop the execution without causing any errors    lt  DOCTYPE html PUBLIC  -  W3C  DTD XHTML 1 0 Transitional  EN   http   www w3 org TR xhtml1 DTD xhtml1-transitional dtd  gt   lt html xmlns  http   www w3 org 1999 xhtml  dir  ltr  lang  en  gt   lt head gt       lt meta http-equiv  Content-Type  content  text html  charset UTF-8    gt   lt  head gt   lt body gt   lt script type  text javascript  gt  function test1        test2        test3       function test2        alert 2       throw            test4        test5       function test3        alert 3      function test4        alert 4      function test5        alert 5     test1      lt  script gt   lt  body gt   lt  html gt    This is tested with firefox and chrome  I don t know how this is handled by IE or Safari

User · Answer

If you re using nodejs  you can use   process exit  lt code gt

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Global die   function for development purposes   var die   function msg        throw new Error msg       Use die     die  Error message here

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This should kind of work like die     function die msg            if msg           document getElementsByTagName  html   0  innerHTML   msg       else          document open            document write msg           document close              throw msg

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lt script gt       alert  i am ajith fan          lt  php die      gt       alert  i love boxing         alert  i love MMA     lt  script gt

User · Answer

you can try with    return 0    that work in case of stop process

User · Answer

throw new Error  my error message

[javascript] JavaScript equivalent of PHP’s die

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