ECMAScript 6 (ES2015) added the ‘let’ keyword. let works a lot like the legacy ‘var’ keyword, but adds scoping capabilities.
Unfortunately, support cannot be retrofitted to older browsers with a polyfill, supported by IE11(with limitations), Edge 12+, Firefox 44+, Chrome 49+, Safari 10+. If you still need to support older browsers or devices you may want to stick with var.
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Ternary operators, if not abused, can make code easier to follow once you grasp the concept. While normally used for assignment, they can also be used to control program flow. The keys to this are the condition, question mark and colon that identify the condition and results.
var foo = (some_condition) ? then_code : else_code;
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I’ve been a huge fan of the ‘final‘ modifier in Java for function arguments and variables. While there’s some debate on their usefulness for performance, they definitely add in readability and understanding of code as developers are instantly notified by modern IDE’s and when they try to reassign such values as the compiler will indicate the error.
NOTE: Use of final for classes or functions often contradicts the paradigm of Object Oriented programming as you’ll be restricted from extending or overriding those items!