List/Array GO GO GO away

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Array and slice confused me a bit when learning Golang and wanted to share things that I learned along the way.

Array

Developers loves fruits 🍎 so we make an array of fruits

• Arrays size is defined and cannot be resized.
• playground

var a [2]string   // define an array of fixed size.
a[0] = "apple"    // assign value to the array at index 0
a[1] = "banana"
fmt.println(a)    // Print the array     

Slice

• slice is a reference to an array
• slice is dynamically-sized
• slice is more useful than an array
• playground

Literals
// this will create an array of size 3
array := [3]bool{true,false,true} 
// 1. this will create an array
// 2. slice will be created referencing the array in step 1
slice := []bool{true,false,true}

Slice has a length and capacity

• length, is the number of elements it contains
• capacity, is the number of elements in the underlying array for the slice.

Make function

• slice can be created by make function
• make signature from the official documentation

make( type, size, capacity)
-> type : type of slice we want to make, for example []int
-> size : specifies the length
-> capacity : a number no smaller than size, it is the size of an underlying array. If not specified then it is same as size (2nd parameter).

• playground