Javascript basics 6

What will be the result of the following code? console.log(3 + '5');

• 8
• 35
• 53
• 15

How can you check if a variable x is of type "string"?

• typeof(x) === 'string'
• x.type === 'string'
• x instanceof String
• x.typeOf(String)

What is the purpose of the === operator in JS?

• It performs type coercion.
• It assigns a value to a variable.
• It checks for equality without type conversion.
• It concatenates two strings.

Which of the following is not a valid way to declare a variable in JS?

• let x = 5;
• const y = 10;
• var z = 15;
• variable w = 20;

What will the following code snippet print to the console?const numbers = [1, 2, 3, 4, 5]; numbers.forEach(function(num) { console.log(num * 2); });

• 1 2 3 4 5
• 2 4 6 8 10
• 1 4 9 16 25
• 2 3 4 5 6

What is the output of the following code snippet? let a = 10; if (a > 5) { console.log('Hello'); } else { console.log('World'); }

• Hello
• World
• Hello World
• No output

How do you write an if statement that checks if a number x is positive?

• if (x >= 0) { }
• if (x > 0) { }
• if (x < 0) { }
• if (x == 0) { }

Which of the following options correctly declares a function named multiply that takes two parameters and returns their product?

• function multiply(a, { return a + b; }
• function multiply(a, { a * b; }
• function multiply(a, { return a * b; }
• multiply = (a, => a * b;

What is the purpose of the switch statement in JS?

• It defines a function.
• It creates a loop.
• It performs type conversion.
• It allows you to choose between different actions based on different conditions.

Which loop construct is ideal when you want to loop through the properties of an object?

• for loop
• while loop
• do...while loop
• for...in JS?oop