Modern Web Design with HTML5, CSS3, and JavaScript - parseInt versus Number Methods
Interactive Video
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Information Technology (IT), Architecture
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University
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Practice Problem
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Hard
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What event are we listening for in the button?
Focus
Double-click
Click
Hover
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the default data type of input values in HTML?
String
Number
Object
Boolean
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does the Number method return if the input is not a valid number?
Zero
Null
Undefined
NaN
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which method should be used to ensure only numeric values are processed in a switch statement?
Array
parseInt
Boolean
String
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
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
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