isEmpty (JavaScript)

Checks whether a string is empty.

Defined in

isEmpty() : boolean

Return value	Description
`boolean`	True if the string is empty; otherwise false.

An empty string has a length of 0.

For an empty string, s=="" is true, but s==null is false.

(1) This example returns the content of cities.

var cities = "Paris";
// Should not be empty
if (cities.isEmpty()) {
	return "Empty";
} else {
	return "'" + cities + "'";
}

(2) This example returns Empty.

var cities = "";
// Should be empty
if (cities.isEmpty()) {
	return "Empty";
} else {
	return "'" + cities + "'";
}

(3) This example returns the content of cities.

var cities = "   ";
// Should not be empty
if (cities.isEmpty()) {
	return "Empty";
} else {
	return "'" + cities + "'";
}