7.4 - Go Arrays and Slices

Arrays

• Fixed length
• Same type
• Indexable
• Contiguous in Memory

Initialising arrays

var intArr [3]int32

• Default values are set to the default values of the array type
• Indexing and slicing works similar to python, intArr[0] and intArr[1:3]
• We can also change the value at an index using intArr[0] = 123
• &intArr[0] to access the memory location of the value, and each array element is stored 4 places away var intArr [3]int32 = [3]int32{1,2,3} also initialises a new array intArr := [...]int32{1,2,3} also works

Slices

• Are arrays where we can add elements to it, not fixed length
• var intSlice []int32 = []int32{4,5,6}

Methods

• cap(intSlice) ⇒ gets the capacity of the slice
• len(intSlice) ⇒ gets the length of the slice (number of elements)
• append(intSlice, 7)
• append(intSlice, intSlice2…) to append multiple values
• make(int32[] , 3, 8) ⇒ create a slice with specified length and capacity, good for if we know that we do not need to resize the slice