console.log("case 1")
var event = "Year 2021";
console.log(typeof(parseInt(event.split(" ").pop())) === "number");
console.log("case 2")
var event = "Year mukesh";
console.log(typeof(parseInt(event.split(" ").pop())) === "number");
console.log("case 3")
var event = "Year mukesh";
console.log(typeof(event.split(" ").pop()) === "number");
console.log("case 4")
var event = "Year 2021";
console.log(typeof(event.split(" ").pop()) === "number");case 1 when we have a proper number in last place with using parseInt gives true and that is legit!
case 2 when we have a string in last place and still using parseInt...should give false but because of parseInt it gives us valid number type
case 3 when we have a string in last place without using parseInt... gives false that too is legit!
case 4 when we have a number in last place without using parseInt.. gives false that is too is legit! well because "2021" is a string because 2021 is indeed enclosed within " ".
Now how do I check if the last element of the array is a string or an integer because from the user I could receive any combination either a "Hello darkness" or "Hello 221".
Check on jsfiddle for more clarification
CodePudding user response：
Use isNaN to determine whether a value is NaN or not:
console.log("case 1")
var event = "Year 2021";
console.log('Is a number?', !isNaN(event.split(" ").pop()));