Global scope in Javascript - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a global variable named count with value 10.

Javascript

var [1] = 10;

Drag options to blanks, or click blank then click option'

Acount

Blet

Cvar

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using a keyword like 'let' or 'var' as the variable name.

Putting the value where the variable name should be.

The keyword var declares a variable, and count is the variable name. So var count = 10; creates a global variable named count with value 10.

2fill in blank

medium

Complete the code to access the global variable score inside the function and print it.

Javascript

var score = 5;
function showScore() {
  console.log([1]);
}
showScore();

Drag options to blanks, or click blank then click option'

Ascore

Bvar

Cconsole

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to redeclare the variable inside the function.

Using the keyword 'var' inside console.log.

The global variable score can be accessed inside the function by its name score. So console.log(score); prints the value 5.

3fill in blank

hard

Fix the error in the code so the global variable name is updated inside the function.

Javascript

var name = 'Alice';
function changeName() {
  [1] = 'Bob';
}
changeName();
console.log(name);

Drag options to blanks, or click blank then click option'

Alet name

Bconst name

Cvar name

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Redeclaring the variable inside the function with var, let, or const.

Trying to update the variable without assigning a value.

To update the global variable name, just assign a new value to name inside the function without redeclaring it. Using name = 'Bob'; changes the global variable.

4fill in blank

hard

Fill both blanks to create a global variable total and update it inside the function.

Javascript

[1] total = 0;
function addFive() {
  total [2]= 5;
}
addFive();
console.log(total);

Drag options to blanks, or click blank then click option'

Avar

B+

C+=

Dlet

Attempts:

3 left

💡 Hint

Common Mistakes

Using let instead of var for global variable declaration.

Using + instead of += inside the function.

var total = 0; declares a global variable. Inside the function, total += 5; adds 5 to the current value of total.

5fill in blank

hard

Fill all three blanks to create a global variable counter, increment it inside the function, and print it.

Javascript

[1] counter = 1;
function increment() {
  counter [2]= 1;
  console.log([3]);
}
increment();

Drag options to blanks, or click blank then click option'

Avar

Bcounter

C+=

Dlet

Attempts:

3 left

💡 Hint

Common Mistakes

Using let instead of var for global variable.

Using + instead of += for increment.

Printing a wrong variable name.

var counter = 1; declares a global variable. Inside the function, counter += 1; increases it by 1. Then console.log(counter); prints the updated value.