Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Lära Var 3/3 | Data Types and Variables
Introduction to JavaScript

bookVar 3/3

Why var is not used now

Due to hoisting and the global scope declaring variables with the var leads to so much confusion in the code. If we change the value of a variable at just one place intentionally the var will change that value all over the code. It will create so many unexpected results in our code.

Uppgift

Swipe to start coding

Hoisting is used in the following code and this code does not give any error but not a preferable approach. Your task is, using only the let keyword, to re-arrange the variables in the code and display all the variables.

Lösning

Summary:

  • The var is an alternative to the let keyword in JavaScript.
  • Variables declared with var can be accessed before the declaration.
  • The let and const do not allow hoisting but var does.
  • It is not a good practice to use var instead we should use let.

Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 6
single

single

Fråga AI

expand

Fråga AI

ChatGPT

Fråga vad du vill eller prova någon av de föreslagna frågorna för att starta vårt samtal

Suggested prompts:

Sammanfatta detta kapitel

Explain code

Explain why doesn't solve task

close

Awesome!

Completion rate improved to 2

bookVar 3/3

Svep för att visa menyn

Why var is not used now

Due to hoisting and the global scope declaring variables with the var leads to so much confusion in the code. If we change the value of a variable at just one place intentionally the var will change that value all over the code. It will create so many unexpected results in our code.

Uppgift

Swipe to start coding

Hoisting is used in the following code and this code does not give any error but not a preferable approach. Your task is, using only the let keyword, to re-arrange the variables in the code and display all the variables.

Lösning

Summary:

  • The var is an alternative to the let keyword in JavaScript.
  • Variables declared with var can be accessed before the declaration.
  • The let and const do not allow hoisting but var does.
  • It is not a good practice to use var instead we should use let.

Switch to desktopByt till skrivbordet för praktisk övningFortsätt där du är med ett av alternativen nedan
Var allt tydligt?

Hur kan vi förbättra det?

Tack för dina kommentarer!

Avsnitt 3. Kapitel 6
single

single

some-alt