2-D Arrays Practice Quiz¶

Question 1¶

Rearrange the given code to create a 2 dimensional array. You can assume that the rows and cols variables have already been set as global variables.</p>

        let someArray = [];
for (let y = 0; y < rows; y++) {
    someArray.push([])
    for (let x = 0; x < cols; x++) {
        someArray[y].push(0);
    }
}

Question 2¶

2darray-quiz2: What will the following program print?:

let counter = 0;
let someArray = [[0,1,1,0],
                 [1,0,1,0],
                 [1,0,0,0],
                 [0,1,0,1]];
for (let i = 0; i < someArray.length; i++) {
    for (let j = 0; j < someArray[i].length; j++) {
        counter++;
    }
}
console.log(counter);

Question 3¶

2darray-quiz3: What will the following program print?:

let counter = 0;
let someArray = [[0,1,1,0],
                 [1,0,1,0],
                 [1,0,0,0],
                 [0,1,0,1]];
for (let i = 0; i < someArray.length; i++) {
    for (let j = 0; j < someArray[i].length; j++) {
        counter += someArray[i][j];
    }
}
console.log(counter);

Question 4¶

2darray-quiz4: What will the following program print?:

let counter = 0;
let someArray = [[0,1,1,0],
                 [1,0,1,0],
                 [1,0,0,0],
                 [0,1,0,1]];
for (let i = 0; i < 3; i++) {
    for (let j = 0; j < 3; j++) {
        counter += someArray[i][j];
    }
}
console.log(counter);

Question 5¶

2darray-quiz5: What will the following program print?:

let counter = 0;
let someArray = [[0,1,1,0],
                 [1,0,1,0],
                 [1,0,0,0],
                 [0,1,0,1]];
for (let i = 0; i < 3; i++) {
    for (let j = 0; j < 3; j++) {
        counter += someArray[i+1][j+1];
    }
}
console.log(counter);