Which keyword is used to define a class in ES6?
- class
- type
- struct
- interface
In ES6, the class keyword is used to define a class. It provides a cleaner syntax for creating constructor functions and prototypes. Classes allow for easier code organization and inheritance in JavaScript.
A Symbol can be explicitly converted to a string using __________ method.
- toString()
- valueOf()
- convertToString()
- description()
The correct method to explicitly convert a Symbol to a string is toString(). The toString() method is a built-in method for Symbol instances, which returns the string representation of the Symbol.
When implementing a recursive function in ES6, what considerations should be made regarding stack overflow?
- Tail call optimization eliminates the risk of stack overflow in all cases.
- It's essential to handle base cases properly to avoid stack overflow.
- Stack overflow is unavoidable in recursive functions in ES6.
- Increasing the stack size is the only solution to prevent overflow.
When implementing recursive functions in ES6, it's crucial to handle base cases effectively to prevent stack overflow. While tail call optimization can help in some cases, it's not universally guaranteed, making proper base case management a fundamental consideration.
__________ recursion refers to a situation where a recursive function calls itself multiple times within a single step.
- Nested
- Infinite
- Deep
- Tail
In-depth content in the explanation. Recursive functions that call themselves multiple times within a single step are known as deep recursion. This occurs when a function calls itself within a nested structure, leading to multiple recursive calls in one step.
How does currying affect the number of arguments a function receives?
- Increases the number of arguments
- Decreases the number of arguments
- Does not affect the number of arguments
- Allows variable number of arguments
Currying in JavaScript involves breaking down a function with multiple arguments into a series of functions, each taking a single argument. This decreases the number of arguments a function receives, making it more flexible and easier to compose with other functions.
To handle multiple asynchronous tasks with Promises, the Promise._______ method is used, which runs multiple promises in parallel.
- race
- all
- resolveAll
- parallel
The correct option is 'all.' The Promise.all method is used to handle multiple asynchronous tasks with Promises by running multiple promises in parallel. It waits for all promises to resolve and returns an array of their results. The 'race' method resolves or rejects as soon as one of the promises in an iterable resolves or rejects.
Default parameters in a function are used when no argument or ________ is passed.
- undefined
- nan
- nan
- value
Default parameters in a function are used when no argument or undefined is passed. In JavaScript, if a parameter is not passed or is explicitly passed as undefined, the default value assigned to that parameter is used.
What is the key difference in loading dependencies in ES6 Modules compared to CommonJS?
- Imports are hoisted in ES6 Modules
- Synchronous loading in ES6 Modules
- Asynchronous loading in ES6 Modules
- No loading differences
In ES6 Modules, dependencies are loaded asynchronously, allowing for better performance and parallelism. This is in contrast to CommonJS, which loads modules synchronously.
How does the for...of loop interact with iterables in JavaScript?
- The for...of loop automatically iterates over the values of an iterable, making it easier to work with collections like arrays and strings.
- The for...of loop is used only with arrays and not with other iterables.
- The for...of loop is an obsolete feature in JavaScript.
- The for...of loop requires an explicit iterator method.
The for...of loop simplifies the process of iterating over iterables, providing a cleaner syntax compared to traditional for loops. It automatically calls the iterator's next() method and iterates until the done property becomes true.
What is the main purpose of an iterable in JavaScript ES6?
- Iterables allow you to represent a sequence of values that can be iterated (looped) over.
- Iterables are used for defining constants in JavaScript.
- Iterables help in creating asynchronous functions.
- Iterables provide a way to declare variables in JavaScript.
In JavaScript ES6, iterables are objects that implement the iterable protocol, allowing them to be looped over using the new for...of loop. They are crucial for working with collections of data, enabling efficient and concise iteration.