Issue
I’m having an issue understanding how the following statement is working.
// setup
var n = 3;
var J = 3;
var g = 0;
var p = 41;
var m = false;
var O = 22;
var z = 15;
var I = [7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,21,19,20,22,18,20,19,21,7,7,17,17,17,17,17,17,17,17,7,7,0,0,0,0,0,0,0,0,7,7,0,0,0,0,0,0,0,0,7,7,0,0,0,0,0,0,0,0,7,7,0,0,0,0,0,0,0,0,7,7,25,25,25,25,25,25,25,25,7,7,29,27,28,30,26,28,27,29,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,,,22]
// statement
n += J || (g = p, m = p < O ? g - 3 : g + 2, I[m] < z | I[m + O - p] || I[p += p - O]) ? 1 : 0;
At the end of the statement n=4 but I don’t understand how or why. I would expect:
n += 3 || 1 // n = 6
This is someone else’s code I’m trying to understand. Any help is appreciated.
Solution
It’s quite simple.
J || (g = p, m = p < O ? g – 3 : g + 2, I[m] < z | I[m + O – p] || I[p += p – O]) ? 1 : 0
This above equals (J || anything) ? 1 : 0. Since J=3, it’s like (3 || anything) ? 1 : 0.
n += 3 || anything ? 1 : 0 -> n += 1
Answered By – Giovanni Londero
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