Modern JavaScript from the Beginning - Second Edition - Type Coercion

This video tutorial explores type coercion in JavaScript, focusing on how the language implicitly converts data types during operations. It covers examples of coercion between strings and numbers, including addition and multiplication, and explains how JavaScript handles null and undefined values. The tutorial also touches on primitive and reference types, providing a foundation for understanding type conversion and manipulation in JavaScript.

What is the result of adding a number to a string in JavaScript?

• The result is always NaN.

• An error is thrown.

• The string is converted to a number and added.

• The number is converted to a string and concatenated.

When multiplying a string by a number, what does JavaScript do?

• Converts the string to a number and multiplies.

• Throws an error.

• Concatenates the string with the number.

• Returns NaN.

How does JavaScript handle the addition of null to a number?

• Converts null to zero and adds.

• Returns NaN.

• Converts null to one and adds.

• Throws an error.

What numeric value does JavaScript assign to the boolean 'true'?

• 1

• 0

• 2

• -1

What happens when you add undefined to a number in JavaScript?

• The result is NaN.

• The result is zero.

• The result is undefined.

• The result is the original number.