Jose Mourinho – brilliant strategist and tactician

It is known, Jose Mourinho is a genius. He is a master tactician and strategist. He is an a** hole too, but, I don’t care about that till he coaches Chelsea F.C. 

Just yesterday, Manchester United F.C. (one of Chelsea F.Cs biggest rival) completed the transfer of Juan Mata from Chelsea F.C. At first, it didn’t make sense considering Juan is young, has been the ‘Player of the Year,’ at Chelsea F.C, two consecutive years. He is a fantastic player, scores goals, doesn’t create controversies off the field. Chelsea could definitely afford his wages even if he is not playing regularly. The transfer of Juan Mata has been attributed to Jose Mourinho.

I was completely baffled. But, then after some research it all made sense. Jose is a brilliant strategist!

1. Manchester United are 14 points behind Chelsea, so, they are not a title threat to Chelsea F.C. this season.

2. Manchester United F.C. have already played Chelsea twice, so, no more games against them this season.

3. Manchester United F.C. have yet to play a game each against Arsenal F.C, Manchester City F.C. and Liverpool F.C. All these aforementioned clubs are title contenders. Arsenal F.C. are a couple of points ahead of Chelsea F.C. in the title race at the moment. A stronger Manchester United F.C. side could help Chelsea gain ground on these rivals!  

4. Chelsea bags record fee from Manchester United F.C. 37.5 million pounds!

JavaScript – Primitive vs Reference Types

Two areas of confusion around JavaScript primitive vs reference types -
1. If every thing in JavaScript is an object
2. Passed by value vs passed by reference

1. If every thing in JavaScript is an object

This is untrue since JavaScript clearly defines the following primitive types -
1. Number
2. Boolean
3. String
The confusion arises because JavaScript allows us to call methods on primitive types. For example, these are all legal statements -

1['toString']() // outputs 1 as a String

1..toString() // outputs 1 as a String. Note: 1. means 1 followed by decimal

true.toString() // outputs true as a String

"Some Str".toString() // outputs Some Str as a String

It is important to understand how this works. The Number 1, the Boolean true and the String “Some Str” are truly primitive types by themselves, but, when a method is called on them, JavaScript creates a transient or temporary object for the primitive type and tries to call the method. For example, in the case of the Number 1, a transient object is created as follows -

new Number(1) // Transient object

It is also important to understand that the transient object is ‘transient’ and is garbage collected as soon as the method has returned.
From the explanation and example above, we can see, this object like behavior of primitive types is a feature of the language and not of the primitive types themselves.

2. Passed by value vs passed by reference
As a rule of thumb in any programming language, primitive types should be passed by value, whereas, reference types, passed by reference. In JavaScript this is true, except for Strings.
So, Number and Boolean are passed by value. Whereas, everything else, including Array and Function( represented as objects in JS) are passed by Reference. So, what is the deal with Strings? Here is an explanation –

Since a String can be of infinite size, passing it by value will be inefficient, therefore, JavaScript chooses to pass Strings by reference. The good part is, Strings in JavaScript are immutable, meaning once a String object is created it cannot be modified. There is no method available on String that allows us to modify it. For example, Strings do not provide us any such method – insertCharAt or replaceCharAt. This also means, as Javascript developers, we do not have to worry about Strings ever getting modified, even though, they are passed by reference. Also, note, although, Strings are passed by reference for efficiency, they maintain their primitive nature when we compare two Strings. Take the following for example -

"abc" === ("ab" + "c") // true, since values are compared

In short, the issue of how Strings are passed in JavaScript is really not an issue because Strings are immutable.


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