Clean Code in JavaScript

Increment and decrement (prefix and postfix) operators

These four operators technically fall under the umbrella of assignment but they are unique enough to warrant their own section:

• The postfix increment operator (value++)
• The postfix decrement operator (value--)
• The prefix increment operator (++value)
• The prefix decrement operator (--value)

These will simply increment or decrement the value by 1. They're usually found in iteration contexts such as for or while loops. They are best thought of as succinct alternatives to additive and subtractive assignment (that is, value += 1 or value -= 1). However, they have a couple of unique characteristics that are worth covering.