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JavaScript Let
The JavaScript Let keyword introduced in 2015 allows us to define block scoped variables.
Following is the code for declaring variable using Let keyword in JavaScript −
Example
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Document</title> <style> body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample{ font-size: 18px; font-weight: 500; color: red; } </style> </head> <body> <h1>JavaScript Let</h1> <div class="sample"></div> <div style="font-weight: bold; color: black;" class="result"></div> <button class="Btn">CLICK HERE</button> <h3> Click on the above button to access the varible </h3> <script> let sampleEle = document.querySelector(".sample"); document.querySelector(".Btn").addEventListener("click", () => { { let a = 22; sampleEle.innerHTML ="Accessing variable a inside block = " + a + "<br>"; } try { sampleEle.innerHTML = "Accessing variable a outside block = " + a; } catch (err) { sampleEle.innerHTML +="Accessig variable a outside the block = " + err; } }); </script> </body> </html>
Output
On clicking the ‘CLICK HERE’ button −
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