Check for false

Question

Is there any better way of doing this   if borrar       false        alert  tatatata bum bum bum prapra      return false

User · Accepted Answer

If you want to check for false and alert if not, then no there isn't.

If you use if(val), then anything that evaluates to 'truthy', like a non-empty string, will also pass. So it depends on how stringent your criterion is. Using === and !== is generally considered good practice, to avoid accidentally matching truthy or falsy conditions via JavaScript's implicit boolean tests.

User · Answer

You can use something simpler  if  var       console log  var is false

User · Answer

Checking if something isn t false    So it s true  just if you re doing something that is quantum physics  if   borrar       false    or if borrar       true

User · Answer

If you want it to check explicit for it to not be false  boolean value  you have to use if borrar       false   But in JavaScript we usually use falsy and truthy and you could use if  borrar     but then values 0      null  undefined  null and NaN would not generate the alert  The following values are always falsy  false   0  zero      or  quot  quot   empty string   null  undefined  NaN  Everything else is truthy  That includes   0   a string containing a single zero    false   a string containing the text    false          an empty array       an empty object   function      an    empty    function   Source  https   www sitepoint com javascript-truthy-falsy  As an extra perk to convert any value to true or false  boolean type   use double exclamation mark           true    false      true   false     false   undefined     false

User · Answer

If you want an explicit check against false  and not undefined  null and others which I assume as you are using     instead of     then yes  you have to use that  Also  this is the same in a slightly smaller footprint  if borrar        1

User · Answer

Like this  if borrar            Do something    If borrar   returns true then do something  if it is not false

[javascript] Check for false

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