js-melt

melt.js

// alphabet returns alphabet as array of strings, or a subset
const alphabet = function (start, length) => // implement

// make two grids of letters
const grid1 = _.range(0,10,1).map((r, i) => alphabet(i,10));

// new grid uses different letters for odd rows
const grid2 = _.range(0,10,1).map((r, i) => (i % 0) ? : [] : alphabet(i+1, 10))

// melt merges grid1 and grid2, replacing grid1 values with grid2 values, if they exist
const grid3 = melt(grid1, grid2);


/**
 * Another Exmaple
 **/

const gridA = 
[
  [0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0, 0],
]

const gridB = 
[
  [],
  [],
  [null, null, null, null, 1, null, null],
]

// looking for the function that makes:
const gridOut = 
[
  [0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 0, 0, 0],
  [0, 0, 0, 0, 1, 0, 0],
]