Modern Web Design with HTML5, CSS3, and JavaScript - parseInt versus Number Methods

The video tutorial explains the use of switch statements in JavaScript, focusing on evaluating expressions and executing associated statements. It demonstrates setting up interactive input and button elements, converting input values to numbers, and handling non-numeric values. The tutorial compares the parseInt and Number methods for conversion and ensures valid number input for switch statements.

What is the primary function of a switch statement?

• To create interactive input fields

• To add event listeners to buttons

• To evaluate an expression and execute associated statements

• To convert strings to numbers

What event are we listening for in the button?

• Focus

• Double-click

• Click

• Hover

What is the default data type of input values in HTML?

• String

• Number

• Object

• Boolean

What does the Number method return if the input is not a valid number?

• Zero

• Null

• Undefined

• NaN

How does parseInt differ from the Number method?

• parseInt converts strings to booleans

• parseInt returns NaN for all non-numeric inputs

• parseInt extracts numbers from the start of a string

• parseInt does not convert strings at all

Which method should be used to ensure only numeric values are processed in a switch statement?

• Array

• parseInt

• Boolean

• String

What is the result of using parseInt on a string with leading numbers followed by letters?

• Only the leading numbers are returned

• The letters are ignored and the string is returned

• The entire string is returned as NaN

• The entire string is converted to a number