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The best place to view the code associated with this course is in the online book (https://go.asim.dev/angular-book) via the book if a lecture has code associated with it, it then also has a link to a stackblitz instance so you can run and edit the code sample online.
let is a very important addition the javascript language in ES6.
It’s not a replacement to var, var can still be used even in ES6 and has the same semantics as ES5.
However, unless you have a specific reason to use var I would expect all variables you define from now on to use let.