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Examtopics 1D0-735 — JavaScript Specialist Prepaway Real Exam Questions and dumps free download
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1D0-735 — JavaScript Specialist
#Question
How does a callback function work in JavaScript?
A.
It's not supported
B.
It's called at the end of a function
C.
It's passed as an argument
D.
It's called at the beginning of a function
Correct Answer:
C
A callback function is a function passed into another function as an argument, to be executed at a later time.
#Question
How can you access properties of an object using a variable?
A.
obj.varName()
B.
Both A and B
C.
obj['varName']
D.
obj.varName
Correct Answer:
B
You can use dot notation (obj.varName) or bracket notation (obj['varName']) to access object properties.
#Question
What is an IIFE (Immediately Invoked Function Expression)?
A.
A function without parameters
B.
A function that runs immediately
C.
A function that runs after a delay
D.
A named function
Correct Answer:
B
An IIFE is a JavaScript function that is executed immediately after its creation.
#Question
How would you describe the concept of "hoisting" in JavaScript?
A.
A way to declare variables before they are initialized
B.
A method of cleaning up scope
C.
A form of error handling
D.
A type of event listener
Correct Answer:
A
Hoisting is JavaScript's behavior of moving declarations to the top of the current scope, allowing you to use variables before they are declared.
#Question
Which function is called when an object is created in JavaScript?
A.
creator
B.
initializer
C.
constructor
D.
builder
Correct Answer:
C
The constructor function is called when an object is created in JavaScript, initializing its properties.
#Question
What is closure in JavaScript?
A.
A type of loop
B.
None of the Above
C.
A feature allowing a function to access variables from its outer lexical scope
D.
A method of encapsulation
Correct Answer:
C
Closure refers to the ability of a function to access variables from its outer lexical scope, even when the function is executed outside that scope.
1D0-735 — JavaScript Specialist
#Question
How does a callback function work in JavaScript?
A.
It's not supported
B.
It's called at the end of a function
C.
It's passed as an argument
D.
It's called at the beginning of a function
Correct Answer:
C
A callback function is a function passed into another function as an argument, to be executed at a later time.
#Question
How can you access properties of an object using a variable?
A.
obj.varName()
B.
Both A and B
C.
obj['varName']
D.
obj.varName
Correct Answer:
B
You can use dot notation (obj.varName) or bracket notation (obj['varName']) to access object properties.
#Question
What is an IIFE (Immediately Invoked Function Expression)?
A.
A function without parameters
B.
A function that runs immediately
C.
A function that runs after a delay
D.
A named function
Correct Answer:
B
An IIFE is a JavaScript function that is executed immediately after its creation.
#Question
How would you describe the concept of "hoisting" in JavaScript?
A.
A way to declare variables before they are initialized
B.
A method of cleaning up scope
C.
A form of error handling
D.
A type of event listener
Correct Answer:
A
Hoisting is JavaScript's behavior of moving declarations to the top of the current scope, allowing you to use variables before they are declared.
#Question
Which function is called when an object is created in JavaScript?
A.
creator
B.
initializer
C.
constructor
D.
builder
Correct Answer:
C
The constructor function is called when an object is created in JavaScript, initializing its properties.
#Question
What is closure in JavaScript?
A.
A type of loop
B.
None of the Above
C.
A feature allowing a function to access variables from its outer lexical scope
D.
A method of encapsulation
Correct Answer:
C
Closure refers to the ability of a function to access variables from its outer lexical scope, even when the function is executed outside that scope.
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