isnull javascript – How to Check for null or Empty String in JavaScript?
isnull javascript To check for null SPECIFICALLY you would use this: if (result === null). also you can cehck variable are Null, Empty String, Undefined, False, Zero and NaN Test.
isnull javascript – How to Check for null in JavaScript?
if(!pass || !cpass || !email || !cemail || !user){
return results == null ? 0 : (results[1] || 0);
Null Test:
if (result === null) - result = ""; (false) typeof result = string - result = null; (true) typeof result = object - result = undefined; (false) typeof result = undefined - result = false; (false) typeof result = boolean - result = 0; (false) typeof result = number - result = NaN; (false) typeof result = number
Empty String Test:
if (result === '') - result = ''; (true) typeof result = string - result = null; (false) typeof result = object - result = undefined; (false) typeof result = undefined - result = false; (false) typeof result = boolean - result = 0; (false) typeof result = number - result = NaN; (false) typeof result = number
Undefined Test:
if (typeof result == "undefined") -- or -- if (result === undefined) - result = ''; (false) typeof result = string - result = null; (false) typeof result = object - result = undefined; (true) typeof result = undefined - result = false; (false) typeof result = boolean - result = 0; (false) typeof result = number - result = NaN; (false) typeof result = number
Don’t Miss : Check If Object Is Empty In VueJS
False Test:
if (result === false) - result = ''; (false) typeof result = string - result = null; (false) typeof result = object - result = undefined; (false) typeof result = undefined - result = false; (true) typeof result = boolean - result = 0; (false) typeof result = number - result = NaN; (false) typeof result = number
Zero Test:
if (result === 0) - result = ''; (false) typeof result = string - result = null; (false) typeof result = object - result = undefined; (false) typeof result = undefined - result = false; (false) typeof result = boolean - result = 0; (true) typeof result = number - result = NaN; (false) typeof result = number
NaN Test:
if (typeof result == 'number' && !parseFloat(result) && result !== 0) -- or -- if (isNaN(result)) - result = ''; (false) typeof result = string - result = null; (false) typeof result = object - result = undefined; (false) typeof result = undefined - result = false; (false) typeof result = boolean - result = 0; (false) typeof result = number - result = NaN; (true) typeof result = number
I hope you get an idea about isnull javascript.
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