How to read ( understand) scala standard library function?

Syntax
1

Hi All, Sorry if its been asked before. I tried to look for the answer in many places, but could not find it.
Is there any resource ( blog or video etc ) on how to understand the syntax of scala standard library function definition? for example

@ val a = Set(1,2,3)
a: Set[Int] = Set(1, 2, 3)

I want to know what this function ( for example reduceLeft) does by pressing tabs and I got below

@ a.reduceLeft
def reduceLeft[B >: A](op: (B, A) => B): B
Now I want to understand such syntax without looking for help so that I can start practicing on it.

There must be some resources on how to understand such syntax? is there any easier way?

2

Tour of Scala might help learning syntax and language features.

If you want to visually understand Scala standard library functions, such as Seq#reduceLeft, visual Scala reference might help is a good resource.

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3

Thank you so much

4

If you have a Java background, you may find the following helpful (download for best quality):

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The aggregate function - from sequential and parallel folds to parallel aggregation - Java and Scala

5

@rabinjais7 Please get a high quality source and spend some time with it to properly understand the language. This will save you a ton of time in the long term.

Avoid short tutorials / videos / Stackoverflow / Google searches. Also please do not try to learn it from the documentation. Documentation should be used as reference only, not as a proper learning resource.

I recommend:

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6

What part of that syntax you don’t understand?
Also, have you checked the Scaladoc?

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7

there are some Scala book recommendations at Books | Scala Documentation

(Introduction | Tour of Scala | Scala Documentation is definitely useful for quickly looking up a thing you haven’t seen before, to get a basic idea of what something is, but it’s not a comprehensive language intro)

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