Walmart SDE (Software Development Engineer) Interview Questions, Process, and Tips

Arrow functions do not have their own 'this' value, which is required in constructors.

• Arrow functions do not have a 'this' binding, so 'this' will refer to the parent scope.

• Constructors require 'this' to refer to the newly created object.

• Using arrow functions in constructors can lead to unexpected behavior and errors.

CORS stands for Cross-Origin Resource Sharing and is a security feature implemented in web browsers.

• CORS allows web servers to specify which origins are allowed to access their resources.

• It is used to prevent unauthorized access to resources on a different domain.

• CORS is implemented using HTTP headers such as Access-Control-Allow-Origin and Access-Control-Allow-Methods.

• It is important to properly configure CORS to avoi...read more

Lexical scoping is a way of defining variable scope based on where they are declared in the code.

• Variables declared inside a function have local scope and are not accessible outside the function.

• Variables declared outside a function have global scope and can be accessed from anywhere in the code.

• Nested functions can access variables declared in their parent function.

• Example: function outer() { let x = 10; function inne...read more

Arrow functions have concise syntax, implicit return, and lexical this binding.

• Shorter syntax than traditional function expressions

• Implicit return of a single expression

• Lexical this binding, avoiding the need for .bind() or self = this

• Example: const double = (num) => num * 2;

• Example: const names = ['Alice', 'Bob', 'Charlie']; const nameLengths = names.map(name => name.length);