JavaScript Basic 1

What keyword is used to declare a variable in JavaScript?

• let

• function

• name

• variable

How do you define a function in JavaScript?

• functionName(parameters) { // code here }

• functionName(parameters) // function body

• function functionName(parameters) { // function body }

• functionName(parameters) { // function body }

Which keyword is used for creating conditional statements in JavaScript?

• switch

• loop

• function

• if

How do you access the elements of an array in JavaScript?

• arr[index]

• arr.index

• arr{index}

• arr[element]

In JavaScript, what data type is used to store multiple values in a single variable?

• boolean

• number

• array

• string

How do you create an object in JavaScript?

• obj = [key: value];

• variable obj = new Object();

• createObject();

• let obj = { key: value };

What is the result of the expression 5 === '5' in JavaScript?

• false

• undefined

• 5

• true

What is the purpose of the 'else' statement in JavaScript?

• To execute a block of code if the condition in the 'if' statement is false.

• To check if the condition in the 'if' statement is true.

• To terminate the program if the 'if' condition is met.

• To skip the 'if' statement and directly execute the code inside the 'else' block.

Which is not a loop?

• while (let key in obj) { console.log(key); }

• if(number === 2) {

  console.log(key)

  }

• Object.keys(obj).forEach(key => { console.log(key + ': ' + obj[key]); })

• for (let value of obj) { console.log(value); }

What is the purpose of the 'return' statement in a function in JavaScript?

• To stop the execution of the function

• To return a value from the function

• To skip the function and move to the next one

• To print a message to the console