Advanced JavaScript (original) (raw)

What is the call stack in JavaScript?

• A data structure to store variable names
• A data structure that manages function execution contexts
• A function that executes asynchronous code
• A method to clear all function calls

What will the following code log?

JavaScript `

console.log(a); var a = 10;

`

Which of the following statements about closures is true?

• A closure is created only when using this.
• A closure allows a function to access variables from its lexical scope.
• Closures are not allowed in arrow functions.
• Closures are created during runtime only.

What is the purpose of the 'this' keyword in the global execution context?

• Refers to the current object
• Refers to the global object
• Refers to the parent function
• Refers to the currently executing function

What will the following code log?

JavaScript `

function outer() { let a = 10; return function inner() { console.log(a); }; } const fn = outer(); fn();

`

What is a key feature of WeakMap in JavaScript?

• Keys are weakly referenced and cannot be primitive values.

What will the following generator function output?

JavaScript `

function* generator() { yield 1; yield 2; yield 3; } const gen = generator(); console.log(gen.next().value);

`

Which of the following is a characteristic of a pure function?

• Modifies global variables
• Always produces the same output for the same input
• Depends on external state
• Throws an error if input is invalid

What is currying in functional programming?

• Breaking a function into smaller functions
• Transforming a function to take multiple arguments into one that takes them one at a time
• Chaining multiple function calls
• Combining multiple functions into a single function

What will the following code log?

JavaScript `

const n = [1, 2, 3]; const doubled = n.map((n) => n * 2); console.log(doubled);

`

There are 10 questions to complete.

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