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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

bookJavaScript and Type Conversion

JavaScript is a dynamic-type language:

We can assign any type of value to a variable. We can also change the type of a variable at any time and any position in the code. Let’s say we have assigned a string value to a variable, and then we want to change the type of that variable to a number.


              
123

            
let totalPrice = "thousand";
totalPrice = 1000;
console.log(totalPrice);
copy

Tarefa

A variable named totalDaysInMonth with the assigned string value of thirty has been given to you. Your task is to change the type of the variable from string to a number and display it on the console.

Summary:

  • The number datatype is for all kinds of numbers like integer or floating-point numbers.
  • The boolean variables can only have true or false as their values.
  • The typeof operator allows us to see the type of value stored in a variable.
  • JavaScript is a dynamic-type language, so we can change the type of data in it.

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Seção 3. Capítulo 3
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bookJavaScript and Type Conversion

JavaScript is a dynamic-type language:

We can assign any type of value to a variable. We can also change the type of a variable at any time and any position in the code. Let’s say we have assigned a string value to a variable, and then we want to change the type of that variable to a number.


              
123

            
let totalPrice = "thousand";
totalPrice = 1000;
console.log(totalPrice);
copy

Tarefa

A variable named totalDaysInMonth with the assigned string value of thirty has been given to you. Your task is to change the type of the variable from string to a number and display it on the console.

Summary:

  • The number datatype is for all kinds of numbers like integer or floating-point numbers.
  • The boolean variables can only have true or false as their values.
  • The typeof operator allows us to see the type of value stored in a variable.
  • JavaScript is a dynamic-type language, so we can change the type of data in it.

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 3. Capítulo 3
toggle bottom row

bookJavaScript and Type Conversion

JavaScript is a dynamic-type language:

We can assign any type of value to a variable. We can also change the type of a variable at any time and any position in the code. Let’s say we have assigned a string value to a variable, and then we want to change the type of that variable to a number.


              
123

            
let totalPrice = "thousand";
totalPrice = 1000;
console.log(totalPrice);
copy

Tarefa

A variable named totalDaysInMonth with the assigned string value of thirty has been given to you. Your task is to change the type of the variable from string to a number and display it on the console.

Summary:

  • The number datatype is for all kinds of numbers like integer or floating-point numbers.
  • The boolean variables can only have true or false as their values.
  • The typeof operator allows us to see the type of value stored in a variable.
  • JavaScript is a dynamic-type language, so we can change the type of data in it.

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!

JavaScript is a dynamic-type language:

We can assign any type of value to a variable. We can also change the type of a variable at any time and any position in the code. Let’s say we have assigned a string value to a variable, and then we want to change the type of that variable to a number.


              
123

            
let totalPrice = "thousand";
totalPrice = 1000;
console.log(totalPrice);
copy

Tarefa

A variable named totalDaysInMonth with the assigned string value of thirty has been given to you. Your task is to change the type of the variable from string to a number and display it on the console.

Summary:

  • The number datatype is for all kinds of numbers like integer or floating-point numbers.
  • The boolean variables can only have true or false as their values.
  • The typeof operator allows us to see the type of value stored in a variable.
  • JavaScript is a dynamic-type language, so we can change the type of data in it.

Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
Seção 3. Capítulo 3
Switch to desktopMude para o desktop para praticar no mundo realContinue de onde você está usando uma das opções abaixo
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