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# Learn ES6 (ECMAScript 2015)  This course takes a look at some of the new features that JavaScript has available with ES6 (ECMAScript 2015). It is a "montage" from several instructors. Each lesson's code is in its corresponding lesson folder. Plunks are drawn from the lesson's branch.
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Plunker</title> </head> <body> <script src="script.js"></script> </body> </html>
function varFunc(){ var previous = 0; var current = 1; var i; var temp; for(i = 0; i < 10; i+=1){ temp = previous; previous = current; current = temp + current; } console.log(current) || displayInPreview(current); } function letFunc(){ let previous = 0; let current = 1; for(let i = 0; i < 10; i+=1){ let temp = previous; previous = current; current = temp + current; } console.log(current) || displayInPreview(current); } varFunc(); letFunc(); // display in plunker preview function displayInPreview(string) { var newDiv = document.createElement("div"); var newContent = document.createTextNode(string); newDiv.appendChild(newContent); document.body.appendChild(newDiv) }