I am trying to compare grid[i][j] with the index directly above it, then return all of the values that are different. So if grid[i][j] does not match the one above it, the code should return grid[i][j].
I thought that [i-1] would work (directly below👇 ), but i am just getting an error of cannot read properties of undefined.
if(grid[i][j] !== grid[i-1][j]){
return grid[i][j]
}
Here is the test case:
[["1","0","1","1","0"],["1","1","0","1","0"],["1","1","0","0","0"],["0","0","0","0","0"]]
below is the code that i have written:
var numIslands = function(grid) {
for(let i = 0; i < grid.length; i++){
for(let j = 0; j < grid.length; j++){
let ans = 0;
if(grid[i][j] === '1'){
if(grid[i][j] !== grid[i-1][j]){
return grid[i][j]
}
}
}
}
};
Does this match your desired output?
let x = [ // Expected Outputs:
["1", "0", "1", "1", "0"], // _, 1, 0, _, _
["1", "1", "0", "1", "0"], // _, _, _, 0, _
["1", "1", "0", "0", "0"], // 0, 0, _, _, _
["0", "0", "0", "0", "0"] // = 1, 0, 0, 0, 0
]
for (let i = 0; i < x.length; i++) {
let lower = x.slice(i + 1, i + 2)
for (let j = 0; j < x[0].length; j++) {
if (!lower.length) {
continue
}
if (lower[0][j] != x[i][j]) {
console.log(lower[0][j])
}
}
}