coffeescript check for null or empty string

You can use the coffeescript or= operation If you need to check that the co...

You can use the coffeescript or= operation If you need to check that the content is a string, not null and not an array, use a simple typeof.

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If email is null or doesn't have a if the email string is empty....

If email is null or doesn't have a if the email string is empty.

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falsyness of zero, empty string, null and undefined. . If you really want t...

falsyness of zero, empty string, null and undefined. . If you really want to check for false, then use if var isnt false, or just unless var. alangpierce pushed a commit to alangpierce/coffeescript that referenced this issue on.

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whereas in CoffeeScript you get dwn.220.v.uang() . Surprise: concatenating ...

whereas in CoffeeScript you get dwn.220.v.uang() . Surprise: concatenating expressions checking for null/undefined values is faster than concatenating simple variables . Implicit empty string in interpolated conditionals #

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Checking the existence of a variable In JavaScript there is no built-in way...

Checking the existence of a variable In JavaScript there is no built-in way Existential operator? can be used in three useful ways in CoffeeScript. 'undefined' && variable!== null){ dwn.220.v.ua('variable was declared and . than ||= provides, for cases where you may be handling numbers or strings.

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CoffeeScript's syntax only covers a subset of JavaScript's, the f...

CoffeeScript's syntax only covers a subset of JavaScript's, the famous Good Parts, so already . Blank strings, null, undefined and the number 0 are all coerced to false If you want to explicitly check for null and undefined, then you can use.

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In JavaScript it's pretty common to check if a variable has been creat...

In JavaScript it's pretty common to check if a variable has been created. "undefined" && someVariable!== null) { // code goes here }.

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Checking for Undefined, Null, and Empty Variables in JavaScript Feb 11th, e...

Checking for Undefined, Null, and Empty Variables in JavaScript Feb 11th, existence level 3 (variable initialized to an empty String) var foo4.

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null undefined NaN empty string ("") 0 false. See Also Is there a...

null undefined NaN empty string ("") 0 false. See Also Is there a standard function to check for null, undefined, or blank variables in JavaScript?

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CoffeeScript is a little language that compiles into JavaScript. Underneath...

CoffeeScript is a little language that compiles into JavaScript. Underneath that awkward Java-esque patina, JavaScript has always had a gorgeous heart.

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If you need to check that the content is a string, not null and not an arra...

If you need to check that the content is a string, not null and not an array, use a simple typeof comparison: if typeof email isnt "string" typeof email isnt "string" '' 'a'.

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CoffeeScript gotchas (part 1): Comments, strings, booleans, arrays and . th...

CoffeeScript gotchas (part 1): Comments, strings, booleans, arrays and . this is not testing if a value is “falsey” (like a empty string, number 0, empty array, etc.) feature on object properties or when you want to check if the value isn't null or of.

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This article covers a simple function which detects empty values. Example e...

This article covers a simple function which detects empty values. Example empty values include null, undefined, the empty string, and empty.

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-c, --compile, Compile dwn.220.v.ua script into dwn.220.v.ua JavaScript fil...

-c, --compile, Compile dwn.220.v.ua script into dwn.220.v.ua JavaScript file of the same name. command is installed, use it to check the compilation of a CoffeeScript file. var fill; fill = function(container, liquid) { if (liquid == null) { liquid = "coffee"; } .. in JavaScript. if (variable) comes close, but fails for zero, the empty string, and false.

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Javascript (and CoffeeScript by extension) also has native map and reduce H...

Javascript (and CoffeeScript by extension) also has native map and reduce Here it works on the basis that we want to check for an index greater than -1 . gives an empty string in case the array value is undefined or null.

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