javascript check for undefined
if (typeof myVariable === 'undefined'){
//myVariable is undefined
}javascript check for undefined
if (typeof myVariable === 'undefined'){
//myVariable is undefined
}javascript if undefined
if(typeof comment === 'undefined') {
alert('Variable "comment" is undefined.');
} else if(comment === null){
alert('Variable "comment" is null.');
}javascript check if boolean is undefined
if (typeof myFlag !== "undefined") {
// comes here whether myFlag is true or false but not defined
}nodejs check if variable is undefined
if ( typeof query !== 'undefined' && query )
{
//do stuff if query is defined and not null
}
else
{
}undefined javascript check
if(undefinedElement === null) {
console.log("Element is undefined");
}Copyright © 2021 Codeinu
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