π Day 9οΈβ£ / 3οΈβ£0οΈβ£ days of basics in JavaScript series
β What is var, let, and const keyword in JS?
β What is the difference between var, let, and const keywords in JavaScript?
#javascript30
Let me explain!π§΅π
β What is var, let, and const keyword in JS?
β What is the difference between var, let, and const keywords in JavaScript?
#javascript30
Let me explain!π§΅π
π In JavaScript, developers can declare a variable using 3 keywords.
1οΈβ£ var
2οΈβ£ let
3οΈβ£ const
1οΈβ£ var
2οΈβ£ let
3οΈβ£ const
1οΈβ£ var (oldest way)
β It is the oldest way to declare a variable.
β Using the var keyword we can re-assign the value to the variable.
β Declaring a variable name with the same name is also allowed.
β The scope of the var keyword is global/function scope.
βMore in nextπ§΅
β It is the oldest way to declare a variable.
β Using the var keyword we can re-assign the value to the variable.
β Declaring a variable name with the same name is also allowed.
β The scope of the var keyword is global/function scope.
βMore in nextπ§΅
2οΈβ£ let
β Re-assigning is allowed.
β But, declaring a variable with the same name is not allowed.
β The scope of the let keyword is block scope.
β More about on scope in the upcoming π§΅
β Re-assigning is allowed.
β But, declaring a variable with the same name is not allowed.
β The scope of the let keyword is block scope.
β More about on scope in the upcoming π§΅
3οΈβ£ const
β Re-assigning is not allowed.
β Declaring a variable name with the same is also not allowed.
β The scope of the let keyword is also block scope.
β More about on scope in the upcoming π§΅
β Re-assigning is not allowed.
β Declaring a variable name with the same is also not allowed.
β The scope of the let keyword is also block scope.
β More about on scope in the upcoming π§΅
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But if you like make sure to:
1. Follow me @ATechAjay
2. Retweet the first tweet.
3. Turn on the notification to never miss these amazing tweets.
Thank you so much for staying to the end of this thread.
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