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Questions and Answers
In programming, what is the purpose of a "closure"?
In programming, what is the purpose of a "closure"?
- To encapsulate data within a function. (correct)
- To prevent code from executing until a condition is met.
- To pass arguments to a function by reference.
- To create parallel execution of code blocks.
Which of the following JavaScript data types is not considered a primitive type?
Which of the following JavaScript data types is not considered a primitive type?
- String
- Number
- Boolean
- Array (correct)
What is the difference between "null" and "undefined" in JavaScript?
What is the difference between "null" and "undefined" in JavaScript?
- They are essentially the same and can be used interchangeably.
- "Null" indicates the absence of a value, while "undefined" means a variable has been declared but not assigned a value. (correct)
- "Null" is a primitive data type, while "undefined" is an object.
- "Undefined" is a keyword used for function parameters, while "null" is used for variable declarations.
In CSS, what is the purpose of the "z-index" property?
In CSS, what is the purpose of the "z-index" property?
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In SQL, what does the "JOIN" clause do?
A.
B.
C.
D.
In SQL, what does the "JOIN" clause do? A. B. C. D.
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In Node.js, what is the purpose of the "cluster" module?
In Node.js, what is the purpose of the "cluster" module?
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