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Questions and Answers
Which of the following is NOT a data type in JavaScript?
Which of the following is NOT a data type in JavaScript?
- String
- Float (correct)
- Boolean
- Object
What does the '=== operator' in JavaScript do?
What does the '=== operator' in JavaScript do?
- Checks if two values are equal in type, but not necessarily in value
- Checks if two values are equal in value and type (correct)
- Checks if two values are equal in value, but not necessarily in type
- Checks if two values are equal in value, but not necessarily in type
What is the purpose of the 'querySelector' method in JavaScript?
What is the purpose of the 'querySelector' method in JavaScript?
- To select the first element that matches a specified CSS selector (correct)
- To select a random element that matches a specified CSS selector
- To select all elements that match a specified CSS selector
- To select the last element that matches a specified CSS selector
Study Notes
JavaScript Fundamentals
- JavaScript has several data types, but Symbol is not one of them (available data types include Number, String, Boolean, Null, Undefined, Object, and Array).
Comparator Operators
- The '===' operator in JavaScript is a strict equality operator, which checks both the value and data type of two variables for equality.
Document Object Model (DOM) Methods
- The 'querySelector' method in JavaScript returns the first element within a document that matches the specified selector or group of selectors.
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Description
Test your knowledge of JavaScript with this quiz! Find out if you can identify which data type is NOT recognized in JavaScript. Learn what the '===' operator does and how it differs from other comparison operators. Understand the purpose of the 'querySelector' method and how it can be used in JavaScript programming.
