Mastering Go - Second Edition

The shortcomings of Go arrays

Go arrays have many disadvantages that will make you reconsider using them in your Go projects. First of all, once you define an array, you cannot change its size, which means that Go arrays are not dynamic. Putting it simply, if you need to add an element to an existing array that has no space left, you will need to create a bigger array and copy all the elements of the old array to the new one. Also, when you pass an array to a function as a parameter, you actually pass a copy of the array, which means that any changes you make to an array inside a function will be lost after the function exits. Lastly, passing a large array to a function can be pretty slow, mostly because Go has to create a copy of the array. ...