Loop Party, You are invited.

loops.js

/* some wild-ass loop parties */

var x = 6;
var numberArray = [
  1,  /* 0th item, b/c arrays *index* from 0 */
  2,  /* 1st item */
  3   /* 2nd item */
];


for (ii = 0;   /* loop variable starts at 0 */
  ii < numberArray.length;   /* condition to check at BEGINNING  of each loop 
                               if TRUE, then we STOP RIGHT NOW */
  ii ++   /* what to do BETWEEN loops, after 1st */
  ) {
  console.log("start of loop", "ii", ii, 'num', numberArray[ii], "x=", x);
  x = x + numberArray[ii];
  console.log("end of loop X", x)
}

/*
(implict 0th steps:
  - set ii to 0;
  - check if 0 < numberArray.length
)

start of loop ii 0 num 1 x= 6
end of loop X 7
start of loop ii 1 num 2 x= 7
end of loop X 9
start of loop ii 2 num 3 x= 9
end of loop X 12

*/