Type Conversion

The video tutorial covers type conversion and coercion in JavaScript. It explains how to convert different data types, such as numbers, booleans, dates, and arrays, into strings using functions and methods like String() and toString(). It also demonstrates converting strings to numbers using Number(), parseInt(), and parseFloat(). The concept of type coercion, where JavaScript automatically converts data types, is also discussed. The tutorial concludes with a brief mention of the math object, which will be covered in the next video.

Why is type conversion important when dealing with form inputs in JavaScript?

• To ensure all data is stored as strings.

• To allow calculations on input data.

• To prevent data from being submitted.

• To convert all data to Boolean.

Which method can be used to convert a number to a string in JavaScript?

• parseInt

• Number

• toString

• parseFloat

What will be the result of converting the Boolean value 'true' to a string?

• '1'

• 'true'

• 'false'

• '0'

How does JavaScript represent a value that cannot be converted to a number?

• NaN

• null

• Infinity

• undefined

What is the result of parsing the string '100.30' using parseInt?

• 100.30

• 0

• 100

• NaN

Which function would you use to convert a string with decimals to a number?

• Number

• parseFloat

• toString

• parseInt

What is the result of converting the string 'hello' to a number?

• 0

• NaN

• undefined

• null

What does type coercion in JavaScript refer to?

• Manually converting data types.

• JavaScript automatically converting data types.

• Using the parseInt function.

• Using the toString method.

If you add a string and a number in JavaScript, what will happen?

• The result will be NaN.

• An error will occur.

• The string will be converted to a number.

• The number will be converted to a string.

What will be the result of adding a number and a string in JavaScript?

• The result will be a concatenated string.

• An error will occur.

• The string will be converted to a number.

• The number will be added to the string.