Increment and decrement

Jyro provides prefix and postfix increment/decrement operators for numeric values.

Postfix

Postfix operators return the original value, then modify the variable:

var x = 5
var y = x++    # y is 5, x is now 6
var z = x--    # z is 6, x is now 5

Prefix

Prefix operators modify the variable first, then return the new value:

var x = 5
var y = ++x    # x is now 6, y is 6
var z = --x    # x is now 5, z is 5

Properties and indexes

Increment and decrement operators also work on object properties and array elements:

var obj = {count: 10}
obj.count++            # obj.count is now 11

var arr = [5, 10, 15]
arr[0]++               # arr is now [6, 10, 15]
--arr[2]               # arr is now [6, 10, 14]

Summary

Operator	Returns	Effect
x++	Old value of x	Increments x by 1
x--	Old value of x	Decrements x by 1
++x	New value of x	Increments x by 1
--x	New value of x	Decrements x by 1