Introduction to JavaScript: First Steps/

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Using Operators with Different Types

Using Operators with Different Types

Learn what happens when we try to add, subtract, and divide strings. We'll cover how JavaScript handles 'abc' + 20. Learn what NaN is. We'll also discuss type coercion, a very import concept in JavaScript.

We'll cover the following...

Different Variable Types

We’ve shown these operators being used on numbers only. They can also be used with other variable types.

Node.js
let string1 = 'Hello ';
let string2 = 'there!';
console.log(string1 + string2); // -> Hello there!

String addition just joins the strings together into a new, larger string.

NaN

What happens if we try to use the other operators with strings? We get a new value: NaN.

Node.js
let string1 = 'Hello ';
let string2 = 'there!';
console.log(string1 - string2); // -> NaN
console.log(string1 * string2); // -> NaN
console.log(string1 / string2); // -> NaN
console.log(string1 % string2); // -> NaN

NaN is technically a number ...