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How Does the \'append\' Operation Expand Slices in Go?

Linda Hamilton

Oct 30, 2024 am 02:36 AM

How Does the 'append' Operation Expand Slices in Go?

Exploring the Slice Expansion Mechanism in 'append'

In the realm of Go programming, the 'append' operation efficiently adds elements to a slice. However, there arises a query about the algorithm employed to expand the slice when it reaches capacity.

Algorithm for Slice Enlargement

The mechanism responsible for slice enlargement is ingrained within the 'append' function. Its implementation can be traced to the Go source code found here:

(commit date: Oct 26, 2016)

The Evolution of Expansion Rules

Over the years from 2014 to 2020, the following rules have governed slice expansion:

If the append operation would increase the slice length by more than double, the new capacity is set equal to the new length.
Otherwise, the capacity is doubled (if the current length is less than 1024) or increased by 25% (if the length is larger). This step is repeated until the capacity accommodates the required length.

A Note on Specificity

It's worth noting that the precise expansion algorithm is not explicitly outlined in the Go specification. Consequently, these heuristics are subject to potential modification in future Go versions.

For the most up-to-date insights into the slice expansion algorithm, it's advisable to inspect the implementation on the master branch of the Go repository.

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