Works exactly as you might expect. In the console:
1 + 1 > 2 var a = 2, b = 4; a + b; > 6
However, there are some oddities. Adding strings creates concatenation:
"Bill" + "Oddy"; > BillOddy
…while adding Boolean values creates numerical results that correspond to Boolean states:
var a = true, b = false; a + b; > 1 var a = false, b = 0; a + b; > 0
Adds 1 to the current number; frequently used in loops.
var i = 12; i++; > 13
Performs just like the mathematical operator, including the production of negative numbers:
var x = 22, y = 42; x - y; > -20
Subtracts 1 from the current number. Again, often used in loops.
var m = 22; m--; > 21
Division works as expected:
var numerator = 2, divisor = 3; numerator / divisor; > 0.666666
Division by 0 is a problem, obviously:
2 / 0 > Infinity
Also works as expected; note that the operator is the asterisk symbol, not
var bird = 2, hand = 3, bush = 4; bird * hard * bush; > 24
Divides two values and provides the remainder. Frequently used with time, date and calendar operations.
6 % 4 > 2
(Meaning: 6 can be divided by 4 once, leaving 2 left over)
-5 % 4 > -1
Order of Operations
2 + 4 * 5 > 22
To make the order clear, place terms in parentheses: these will be executed first:
(2 + 4) * 5 > 30
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