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.');
}
js check if undefined
let foo = undefined
//will return true
typeof foo === 'undefined'
javascript test if undefined
if (angular.isDefined(var){
//myVariable is undefined
}
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