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[image] Learn JavaScript Tutorial javatpoint. JavaScript.
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[Audio] Javascript Values. Click Me!. The JavaScript syntax defines two types of values:.
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[Audio] Javascript Variables. Click Me!. Declaring a JavaScript Variable.
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[Audio] Declaring a Javascript Variable. Click Me!.
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[Audio] Declaring a Javascript Variable. Click Me!.
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[Audio] 1. Automatically Declared when first used.
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[Audio] 2. Using var to declare variable. Output.
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[Audio] 3. Using let to declare variable. Output.
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[Audio] 4. Using const to declare variable. Output.
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[Audio] Reassigning variable value. Click Me!. [image] var Allowed Reassign Value let Allowed const Not Allowed.
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[Audio] Re-Declaring Javascript Variables. Click Me!.
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[Audio] Variable Scope. Click Me!. Scope determines the accessibility of variables, objects, and functions from different parts of the code..
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[Audio] Block Scope. A block in JavaScript involves opening and closing curly braces:.
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[Audio] Local Scope // code here can NOT use carName function myFunction() // code here can NOT use carName.
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[Audio] Function Scope function myFunction(). Click Me!.
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[Audio] Global Scope var applicantName = "John"; // Global scope let job = "Manager"; // Global Scope const birthday= "20-12-2023"; // Global scope // code here can use applicantName,job and birthday. function jobSearch().
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[Audio] Variable Hoisting. It is JavaScript's default behavior of moving declarations to the top..
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[Audio] Javascript Hoisting (var) <!DOCTYPE html> jobName = "Manager"; document.getElementById("msg").innerHTML = jobName; var jobName;.
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let and const variables, on the other hand, are hoisted, without a default initialization. This makes them inaccessible..
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With const, you cannot use a variable before it is declared. In this example, there will not be any output.
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[Audio] 'var' vs 'let' vs 'const'. KEYWORD SCOPE REDECLARATION & REASSIGNMENT HOISTING var Global, Local yes & yes yes, with default value let Global, Local, Block no & yes yes, without default value const Global, Local, Block no & no yes, without default value.