QSpiders Engineering Student Interview Questions and Answers

Q1. What is the concept of hoisting in javascript programming?
Ans. 
Hoisting in JavaScript is the behavior of moving variable and function declarations to the top of their containing scope during compilation.
• Variables declared with 'var' are hoisted, but their initialization remains in place. Example: console.log(x); var x = 5; // undefined

• Function declarations are fully hoisted, allowing them to be called before their definition. Example: greet(); function greet() { console.log('Hello...read more
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Q2. What is the difference between let, var, and const in JavaScript?
Ans. 
let, var, and const are used for variable declaration in JavaScript, differing in scope, hoisting, and mutability.
• var: Function-scoped or globally scoped; can be redeclared and updated.

• Example: var x = 10; var x = 20; // x is now 20

• let: Block-scoped; cannot be redeclared but can be updated.

• Example: let y = 10; y = 20; // y is now 20; let y = 30; // Error

• const: Block-scoped; cannot be redeclared or updated; must be init...read more
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