Increase and decrease / JavaScript

# Web Site Writing Basics

# javascript

# Reduction operator add value

In JavaScript, the increase operator is + +, increasing the variable value in 1 increments, and the decrease operator is - reducing the variable value in 1 increments. Both can be placed in front of the prefix or after the postfix variable. The positioning will affect the order of operation, for example, + + x will increase the value before use, while x + + will use the same value first, and then increase the value later.

Increase Operator + +

+ + x (Prefix Increment): First increase the value of the variable x by 1 and then apply the new value.

Example: let x = 5; let y = + + x; the result is that y will be 6 and x will be 6.

X + + (Postfix Increment): Apply the current value of the variable x first and then increase the value of x by 1.

Example: let x = 5; let y = x + +; the result is that y will be 5 and x will be 6.

Decrement Operator -

- x (Prefix Decrement): Reduce the value of the variable x by 1 and then apply the new value.

Example: let x = 5; let y = --x; the result is that y will be 4 and x will be 4.

X-- (Postfix Decrement): Apply the current value of the variable x first and then reduce the value of x by 1.

Example: let x = 5; let y = x--; the result is that y will be 5 and x will be 4.

Remember:

Use only with variables: You cannot use + + or - with a numerical value directly, for example, 5 + + will cause an error.