Maths

• Number(s) → +[s] +s
• n=n-1 → n--
• n=n+1 → n++
• all the n = n ° m → n°=m family, with ° being +, -, /, * and %
• ParseFloat(n) → +n
• x!=y → x^y if x and y are integers
• -10 → ~9, -100 → ~99, … and so on :D
• N00…0 with N an integer → Ne00…0
• a>=b → a>b-1 if -10 < b < 10
• a<=b → a<b-1 if -10 < b < 10
• Math.abs(a) → a>0?a:-a if a is one char.
• Math.sqrt(a) → a**.5

Arrays

• a.concat() → [...a]
• x[x.length-N] → x.at(N)

Random

• Math.random()<0.5 → new Date&1, as Date returns a number of ms, albeit it might be problematic if called in a super-tight loop.
• Math.floor(Math.random()*N)) → new Date%N

Misc

• while(1) → for(;;)