Difference between revisions of "Mutation Operators"
From GiderosMobile
| (2 intermediate revisions by one other user not shown) | |||
| Line 17: | Line 17: | ||
=== Examples === | === Examples === | ||
'''Simple larger example''' | '''Simple larger example''' | ||
| − | < | + | <syntaxhighlight lang="lua"> |
score+=1 -- faster and less typing than score=score+1 | score+=1 -- faster and less typing than score=score+1 | ||
| − | </ | + | </syntaxhighlight> |
'''"getDistance" function''' ('''see also the new <big>[[Math.distance]]</big> function''') | '''"getDistance" function''' ('''see also the new <big>[[Math.distance]]</big> function''') | ||
| − | < | + | <syntaxhighlight lang="lua"> |
--Non-optimized variant (5x slower): | --Non-optimized variant (5x slower): | ||
function getDistance( x1, y1, x2, y2 ) | function getDistance( x1, y1, x2, y2 ) | ||
| Line 32: | Line 32: | ||
return ((x2 - x1)^2 + (y2 - y1)^2)^0.5 | return ((x2 - x1)^2 + (y2 - y1)^2)^0.5 | ||
end | end | ||
| − | </ | + | </syntaxhighlight> |
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
{{GIDEROS IMPORTANT LINKS}} | {{GIDEROS IMPORTANT LINKS}} | ||
Latest revision as of 03:00, 1 December 2023
Supported platforms: 
Available since: Gideros 2017.11
Description
Operators to mutate a value.
- a += b = add 'b' to 'a'
- a -= b = subtract 'b from 'a'
- a *= b = multiply 'a' by 'b', result in 'a'
- a /= b = divide 'a' by 'b', result in 'a'
- a %= b = the result of 'a%b' is placed in 'a'
- a ^= b = the result of 'a^b' is placed in 'a' (^ is faster than a=math.pow(a,b))
- a ^= 0.5 = the result is faster than a=math.sqrt(a)
Examples
Simple larger example
score+=1 -- faster and less typing than score=score+1
"getDistance" function (see also the new Math.distance function)
--Non-optimized variant (5x slower):
function getDistance( x1, y1, x2, y2 )
return math.sqrt(math.pow(x2 - x1, 2) + math.pow(y2 - y1, 2))
end
--Optimized variant (5x faster):
function getDistance2(x1, y1, x2, y2)
return ((x2 - x1)^2 + (y2 - y1)^2)^0.5
end
