javascript if undefined
if(typeof comment === 'undefined') {
alert('Variable "comment" is undefined.');
} else if(comment === null){
alert('Variable "comment" is null.');
}javascript if undefined
if(typeof comment === 'undefined') {
alert('Variable "comment" is undefined.');
} else if(comment === null){
alert('Variable "comment" is null.');
}javascript syntax for check null or undefined or empty
if (typeof value !== 'undefined' && value) {
//deal with value'
};Copyright © 2021 Codeinu
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