CodeSignal - Arcade - Intro - JS - Minesweeper

Minesweeper.js

function minesweeper(matrix) {
    let height = matrix.length;
    let width = matrix[0].length;
    
    let outArray = Array.from(Array(height), () => new Array(width));
    
    let mines = 0;
    
    for(let i = 0; i < height; i++) {
        for(let j = 0; j < width; j++) {
            
            mines = 0;
            if(i > 0) {
                if(matrix[i-1][j-1]) mines += 1;
                if(matrix[i-1][j]) mines += 1;
                if(matrix[i-1][j+1]) mines += 1;
            }
            
            if(i < height - 1) {
                if(matrix[i+1][j-1]) mines += 1;
                if(matrix[i+1][j]) mines += 1;
                if(matrix[i+1][j+1]) mines += 1;
            }

            if(matrix[i][j-1]) mines += 1;
            //if(matrix[i][j]) mines += 1;  As it seems you can't count the middle square! welp... I didn't know that!
            if(matrix[i][j+1]) mines += 1;
            
            outArray[i][j] = mines;

        }
    }
    
    return outArray;
}