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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.

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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.

Soluzione

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.

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Sezione 3. Capitolo 6
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bookVar 3/3

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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.

Compito

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.

Soluzione

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.

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Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

close

Awesome!

Completion rate improved to 2
Sezione 3. Capitolo 6
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single

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