javascript if variable is empty code example
Example 1: javascript check if object is null or empty
if (typeof value !== 'undefined' && value) {
//deal with value'
};
Example 2: javascript check if undefined or null or empty string
// simple check do the job
if (myString) {
// comes here either myString is not null,
// or myString is not undefined,
// or myString is not '' (empty).
}
Example 3: javascript check if variable is empty
if( value ) {
//
}
/**
* This will evaluate to true if value is not:
* null
* undefined
* NaN
* empty string ("")
* 0
* false
*/
Example 4: javascript check if empty
//check if string is undefined
if (typeof myVar === 'undefined'){
console.log("I am not defined");
}
//check if string is empty, null, or 0
var emptyString="";
if (emptyString) {
console.log("im not empty");
}