Contenu du cours
Introduction to JavaScript (staging)
Introduction to JavaScript (staging)
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
Null
What is Null
The data type null represents that there is no value. It is a primitive value in javascript.
To have a better understanding of null, we must know these two features about null:
nullprovides the non-existent value or empty value.nullhas to be assigned to a variable as it is not assigned by default (unlike theundefined).
let number = null; console.log(number);
Tâche
Swipe to start coding
Declare a variable selectColor and assign the value of null to the variable and display the value of the variable.
Solution
Passez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessousTout était clair ?
Merci pour vos commentaires !
Section 3. Chapitre 30
Null
What is Null
The data type null represents that there is no value. It is a primitive value in javascript.
To have a better understanding of null, we must know these two features about null:
nullprovides the non-existent value or empty value.nullhas to be assigned to a variable as it is not assigned by default (unlike theundefined).
let number = null; console.log(number);
Tâche
Swipe to start coding
Declare a variable selectColor and assign the value of null to the variable and display the value of the variable.
Solution
Passez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessousTout était clair ?
Merci pour vos commentaires !
Section 3. Chapitre 30
Passez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessous