Clean Code in JavaScript

What is an operator?

An operator in JavaScript is a standalone piece of syntax that forms an expression and is typically used to derive something or compute a logical or mathematical output from a set of inputs (called operands).

Here, we can see an expression containing an operator (+) with two operands (3 and 5):

3 + 5

Any operator can be said to have four characteristics:

• Its arity: how many operands the operator accepts
• Its function: what the operator does with its operands and what it evaluates to
• Its precedence: how the operator will be grouped when used in combination with other operators
• Its associativity: how the operator will behave when neighbored with operators of the same precedence

It's important to understand these foundational ...