My solution for https://www.coderbyte.com/language/Maximal%20Square

maximal-square.js

function MaximalSquare(strArr) { 
    var numRows = strArr.length;
    var numCols = strArr[0].length;
    var maxDim = Math.min(numRows, numCols);
    var dim = maxDim;
    
    while (dim > 0) {
        if (hasSquare(strArr, dim)) {
            return dim * dim;
        }
        dim--;
    }
    
    return 0;
}

function hasSquare(arr, dim) {
    for (var row = 0; row < arr.length; row++) {
        for (var col = 0; col < arr[0].length; col++) {
            if (hasSquareStartingAt(row, col, arr, dim)) {
                return true;
            }
        }
    }
    return false;
}

function hasSquareStartingAt(startingRow, startingCol, arr, dim) {
    var endRow = startingRow + dim - 1;
    if (endRow > arr.length-1) {
        return false;
    }

    var endCol = startingCol + dim - 1;
    if (endCol > arr[0].length-1) {
        return false;
    }

    for (var row = startingRow; row <= endRow; row++) {
        for (var col = startingCol; col <= endCol; col++) {
            var value = parseInt(arr[row][col], 10);
            if (value === 0) {
                return false;
            }
        }
    }
    return true;
}
   
// keep this function call here 
MaximalSquare(readline());