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Introduction to JavaScript

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Naming Identifiers

Good practices for naming identifier

  • Though you can name identifiers in any way you want, it’s a good practice to give a descriptive identifier name.

  • Names should be logical.

  • If you are using an identifier for a variable to store the number of students, it is better to use students , numberOfStudents , or number_of_students rather than x or n .

//valid but not preferable
let n = 10;
console.log(n);

// clear and descriptive name
let numberOfStudents = 10;
console.log(numberOfStudents);

//clear and descriptive name
let number_of_students = 10;
console.log(number_of_students);

              
1234567891011

            
//valid but not preferable
let n = 10;
console.log(n);

// clear and descriptive name
let numberOfStudents = 10;
console.log(numberOfStudents);

//clear and descriptive name
let number_of_students = 10;
console.log(number_of_students);
copy

In both cases, the output is the same but the second and the third identifiers are more meaningful.

Oppgave

Swipe to start coding

Declare a variable, using the const keyword, with the identifier numberOfEmployees and assign the value 50 to that variable and print the value of the variable on the console using the console.log() function.

Løsning

const numberOfEmployees = 50;
console.log(numberOfEmployees);

Summary

  • Identifiers are names for the variables, arrays, functions, objects, and classes.

  • The identifier should follow the above rule.

  • Identifiers should have descriptive names.

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