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#	Let	Var	Const
1	The scope of a let variable is block scope.	The scope of a var variable is functional scope.	The scope of a const variable is block scope.
2	It can be updated but cannot be re-declared into the scope.	It can be updated and re-declared into the scope.	It cannot be updated or re-declared into the scope.
3	It can be declared without initialization.	It can be declared without initialization.	It cannot be declared without initialization.

#	Regular Function	Arrow Function
1	Inside of a regular JavaScript function, this value (aka the execution context) is dynamic.	The behavior of this inside of an arrow function differs considerably from the regular function's this behavior. The arrow function doesn't define its own execution context.
2	As seen in the previous section, the regular function can easily construct objects.	A consequence of this resolved lexically is that an arrow function cannot be used as a constructor.
3	Inside the body of a regular function, arguments is a special array-like object containing the list of arguments with which the function has been invoked.	On the other side, no arguments special keyword is defined inside an arrow function.

Template strings are a powerful feature of modern JavaScript released in ES6. It lets us insert/interpolate variables and expressions into strings without needing to concatenate like in older versions of JavaScript. It allows us to create strings that are complex and contain dynamic elements.

#	ForEach	Filter	Map	Find
1	Foreach takes a callback function and run that callback function on each element of array one by one.	The main difference between forEach and filter is that forEach just loop over the array and executes the callback but filter executes the callback and check its return value.	Map like filter & foreach takes a callback and run it against every element on the array but whats makes it unique is it generate a new array based on your existing array.	Function .find() is also a search function like the previous but they differ in one small detail — this function returns only one match in an array. If in an array is more than one result, the function will return the first that has matched.

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