Зміст курсу
Introduction to JavaScript
Introduction to JavaScript
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
Constant 3/3
const
Does Not Allow Hoisting
As discussed in the previous chapter, let
does not allow hoisting i.e. we cannot use a variable before the declaration. Just like let
we can not use hoisting with the const
.it is only supported with var
.
MYPLANET = 'earth'; console.log(MYPLANET); const MYPLANET;
Завдання
Swipe to start coding
Rearrange the following code to display the value of SALARY
on the console.
Рішення
Summary:
- We can neither change the values of the
const
variables through reassignment nor we can redeclare them. - Value should be assigned to
const
variables at the time of declaration.
Все було зрозуміло?
Дякуємо за ваш відгук!
Секція 3. Розділ 11
Constant 3/3
const
Does Not Allow Hoisting
As discussed in the previous chapter, let
does not allow hoisting i.e. we cannot use a variable before the declaration. Just like let
we can not use hoisting with the const
.it is only supported with var
.
MYPLANET = 'earth'; console.log(MYPLANET); const MYPLANET;
Завдання
Swipe to start coding
Rearrange the following code to display the value of SALARY
on the console.
Рішення
Summary:
- We can neither change the values of the
const
variables through reassignment nor we can redeclare them. - Value should be assigned to
const
variables at the time of declaration.
Все було зрозуміло?
Дякуємо за ваш відгук!
Секція 3. Розділ 11