The parenthesis is optional when there is only 1 parameter. Example 2: Note the differences between x and y. When you want to reassign the variable such as a counter in a for loop, then let is the variable of choice. This does NOT make const immutable, rather it makes const have the property that it cannot be reassigned. Once you assign a value or object to the variable const you can no longer assign it to another value or object. The new way to declare variables in ES6 is using Let and Const: New ways of declaring variables. If you are using the latest versions of google chrome, firefox, safari or edge then almost 100% of the new ES6 features will workĪnd you will not need to use Babel to run the code in your browser. If you don't wish to use a transpiler, or if you would like to see compatibility over time, you can view this site to see which browsers will support the new ES6įeatures. However,ĮS6 javascript can be converted into ES5 code by using a transpiler such asīabel is the most popular transpiler, which converts ES6 into ES5 javascript code, that works in all modern web browsers. One drawback is that ES6 is not yet fully supported in all modern web browsers. The advantage of using ES6 is for it's simplicity and powerfull new features, which we discuss below. ES6 denotes the version or standard of javascript.īefore ES6, there was versions of javascript from ES1 through ES5.ĮS6 is sometimes referred to as ES2015 since ES6 first came out in 2015.
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