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Introduction to JavaScript (staging)
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Introduction to JavaScript (staging)

Introduction to JavaScript (staging)

1. Introduction
Writing our first codeOutput Using Variables 1/2Output Using Variables 2/2
2. JavaScript syntax
JavaScript SyntaxJavaScript VariablesJavaScript OperatorsIdentifiers in JavaScriptNaming IdentifiersReserved keywords in JavaScriptNaming Convention in JavaScript. Case StylesVariables Naming ConventionBoolean Naming ConventionConstant Naming ConventionFunction & Classes Naming ConventionMultiline StringsMultiline Strings. ConcatenatingCommenting in JavaScriptCommenting in JavaScript. Multi-line Comments
3. Data Types and Variables
What are Variables?What are Data-types?JavaScript and Type ConversionVar 1/3Var 2/3Var 3/3Let 1/2Let 2/2Constant 1/3Constant 2/3Constant 3/3Number 1/3Number 2/3Number 3/3Boolean 1/4Boolean 2/4Boolean 3/4Boolean 4/4Strings 1/5Strings 2/5Strings 3/5Strings 4/5Strings 5/5BigInt 1/3BigInt 2/3BigInt 3/3Symbols 1/3Symbols 2/3Symbols 3/3NullUndefinedNull vs Undefined

bookNaming 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.

              
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.

Tarefa

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.

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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Seção 2. Capítulo 5
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bookNaming 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.

              
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.

Tarefa

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.

Summary

  • Identifiers are names for the variables, arrays, functions, objects, and classes.
  • The identifier should follow the above rule.
  • Identifiers should have descriptive names.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 2. Capítulo 5
toggle bottom row

bookNaming 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.

              
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.

Tarefa

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.

Summary

  • Identifiers are names for the variables, arrays, functions, objects, and classes.
  • The identifier should follow the above rule.
  • Identifiers should have descriptive names.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

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.

              
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.

Tarefa

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.

Summary

  • Identifiers are names for the variables, arrays, functions, objects, and classes.
  • The identifier should follow the above rule.
  • Identifiers should have descriptive names.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Seção 2. Capítulo 5
Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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