In this video we will see the First Class Functions in Golang. Understanding F First Class Functions in Golang. Go supports first class functions, higher-order functions, user-defined function types, function literals, closures, and multiple return values.
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Other then the syntactical differences. The main difference is the way the this keyword behaves? In an arrow function, the this keyword remains the same throughout the life-cycle of the function and is always bound to the value of this in the closest non-arrow parent function. Arrow functions can never be constructor functions so they can never be invoked with the new keyword. And they can never have duplicate named parameters like a regular function not using strict mode.
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A few words before we start. You can find the code used in this tutorial in this repository. You can find the full contents of Road to Go Pro here. If you missed the last one, you can find it via this link.
We talked about flow controls and loops in the last part of the tutorial. In this one, we will cover pointers and functions. After finishing the first 4 parts of Road to Go Pro, you are well equipped to start writing scripts or console applications using Go.
In short, a pointer holds the underlying memory address of a value. Whoa, hold on, memory address? Isn’t Go a high-level programming language?
When do we even need to know about the memory addresses of variables?
That’s a good question but before exploring the answer, we need to take a quick detour. Let’s see how to declare pointers and how to use them in functions. Once we have covered these, it will be easier for you to understand the reasoning and examples below. So hang in there.
Whenever we declare a variable in Go, the compiler allocates a segment of memory to store it. The value of that variable is stored there until it is recycled by the garbage collector.
Pointers are composite data types. We form a pointer type by adding an
* in front of the data type it points to. For instance,
*string represents the type of a pointer pointing to a string-type variable.
To get the pointer value of an existing variable, we need to add an
& in front of the variable.
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