JavaScript: Unary Operators

thatgirlvictoria — Wed, 01 Jun 2022 21:57:20 +0000

This is what I learned about unary operators while working on a 8kyu Codewars challenge in further detail.

What are Unary Operators in JavaScript?

To better understand what unary operators are I took apart the word Uni which equals One while operators are a character that represents an action.

Unary operators work on one value. Below is a table to better explain:

Non-numeric values: all unary operators will first convert them into a number.
Unary plus (+) when placed before a numeric value, it does nothing.
Unary minus (-) when placed before a numeric value, it will negate it.
Prefix increment operator (++ before value) adds one to a value. Value is changed before the statement is evaluated.
Postfix decrement operator (-- before value) minus one to a value. Value is changed before the statement is evaluated.
Postfix increment operator (++ before value) adds one to a value. Value is changed after the statement is evaluated.
Prefix decrement operator (-- before value) minus one to a value. Value is changed after the statement is evaluated.

How did I use unary operators to solve a problem?

The goal: If you are given an integer or a floating-point number, find its opposite.

Examples:
   1: -1
   14: -14
   -34: 34

I love writing code that is easy to read, the cleanest way I thought to answer the problem was to use unary minus operator.

function opposite(number) {
  return(-number);
}