js is empty code example
Example 1: javascript check for null variables
var myVar=null;
if(myVar === null){
//I am null;
}
if (typeof myVar === 'undefined'){
//myVar is undefined
}
Example 2: javascript if string empty
// Test whether strValue is empty or is None
if (strValue) {
//do something
}
// Test wheter strValue is empty, but not None
if (strValue === "") {
//do something
}
Example 3: empty javascript
'use strict';
delete Object.prototype; // throws a TypeError
Example 4: empty javascript
function sum(a, a, c) { // !!! syntax error
'use strict';
return a + a + c; // wrong if this code ran
}
Example 5: js is 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");
}