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ES6 ↔ ES2015 - major rework to JS after Apple 🔪 Flash & industry push on JS

aka ES2015

Scope were added to Block inES6

[<span data-tooltip-id="preview__JNZ4qxh2MShLJkZoa">ES6</span>](es-6) add [<span data-tooltip-id="preview__y6XQLpciT6goJCL6S">TDZ</span>](tdz) for [<span data-tooltip-id="preview__M7TvdiZt4vxCZd6h4">Block Scope</span>](block-scope)

why var is bad

ES6 added Promise to escape Callback Hell by chaining a sequence of asynchronous operations instead of using Event & Callback Function

Promises still require use of Callback Function, however, improves JS Syntax by allowing chaining of promises

References​

  1. JS Bundle ↔ single combined JS Code output for Client to run, often Transpile to ES6 for compat