Wingsure Interview Questions and Answers

JS execution happens in two main phases: creation and execution.

• During creation phase, variables are hoisted and memory space is allocated.

• During execution phase, code is executed line by line.

• JS uses a single-threaded, synchronous execution model.

• Functions are first-class citizens in JS, allowing for higher-order functions and closures.

• Event loop and callback queue are used for handling asynchronous operations.

Currying is a technique in JavaScript where a function with multiple arguments is transformed into a sequence of nested functions, each taking a single argument.

• Currying helps in creating reusable functions and partial application.

• It allows you to create new functions by pre-filling some of the arguments of an existing function.

• Example: const add = (a) => (b) => a + b; const add5 = add(5); console.log(add5(3)); // Outp...read more

Lexical scope in JS determines the visibility of variables within a block of code based on where the variables are declared.

• Variables are accessible within the block they are declared in and any nested blocks.

• Variables declared outside of a block are accessible within that block and any nested blocks.

• Example: function outerFunction() { let x = 10; function innerFunction() { console.log(x); } innerFunction(); } outerFun...read more