Let and constThe let and const declarations define block-scoped variables.javascriptJavaScriptwidely2016-09-202019-03-20https://tc39.es/ecma262/multipage/ecmascript-language-statements-and-declarations.html#sec-let-and-const-declarationsletconsthttps://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/letjavascript.statements.constjavascript.statements.lethttps://nowyoucanuse.com/features--let-const.html