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ECMAScript: Automation and System Integration

ECMAScript: Automation and System Integration

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Why is using the || operator problematic when providing default values in configurations?

Because it's slower than ??

Because it can overwrite valid 0, "" or false values

Because it doesn't work with objects

Because the ?? operator can only be used with strings

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In which case is bracket notation for property access REQUIRED?

If the object was declared with const

If the object contains an array

If the property name is not a valid JavaScript identifier

If the property's value is a function

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Which return value is required for an object's methods to form a fluent interface?

return undefined

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In which case does the optional chaining operator NOT stop the chain?

If the value is null

If the property does not exist

If the value is undefined

If the value is 0

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What is the difference between the || and ?? operators?

?? only works with objects, while || works with any value

|| only works with boolean values, ?? works with numbers too

?? always takes precedence over || when evaluating but otherwise they are equivalent

?? only returns the right side for null and undefined, while || does so for any falsy value

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What is one significant advantage of Map over a plain Object?

Map is always much faster

Map is automatically convertible to JSON

Map cannot contain undefined values

A Map can have objects as keys

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What is the result of a function call if there is no return?

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What does "callback" mean?

An object that stores events.

An operator that jumps back to the start of the code.

A variable that holds a function's return value.

A function that we pass as an argument and another function calls later.

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What is the basic principle of event handling in browsers?

We don't use functions for events.

The event handler function runs immediately and then waits for the event.

Event handling only works with timers (setTimeout).

We register a function that runs when an event occurs.

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What is the difference between a parameter and an argument?

A parameter can only be a number; an argument can be any type.

A parameter is the name in the function definition; an argument is the actual value passed when calling.

There is no difference, they are synonyms.

A parameter is the value passed at the call; an argument is the name in the definition.

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