Let's Learn Vocabularies
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নেক্সট Lesson এ যান
Frequently Asked Questions
1.what is the difference between var,let,const?
Var- It is a global scope and Function-scoped, can be redeclared, hoisted.
let- Block-scoped, cannot be redeclared, hoisted but with a "temporal dead zone.
const- Block-scoped, cannot be redeclared or reassigned, hoisted but with a "temporal dead zone.
let- Block-scoped, cannot be redeclared, hoisted but with a "temporal dead zone.
const- Block-scoped, cannot be redeclared or reassigned, hoisted but with a "temporal dead zone.
2.What is the difference between map(),forEach(),and filter()?
map()-Transforms each element in an array and returns a new array with the transformed values.
forEach()- Performs an action on each element, but does not return anything. It’s for side effects (e.g., logging). filter()- Filters elements based on a condition and returns a new array containing only the elements that meet the condition.
forEach()- Performs an action on each element, but does not return anything. It’s for side effects (e.g., logging). filter()- Filters elements based on a condition and returns a new array containing only the elements that meet the condition.
3.What are arrow functions,and how are they different from regular functions ?
In JavaScript, arrow functions are a concise way of writing functions.
4.How do JavaScript Promise Work?
Promise work 3 sub - Pending,Rejected,fulfilled
5.How Does closure work in JavaScript?
A closure is a function that references variables from its outer function and retains the values of those variables, even after the outer function has completed.
এই Lesson এ এখনো কোন Vocabulary যুক্ত করা হয়নি।