How Can I Efficiently Convert Numeric Slices in Go?

Efficiently Converting Slices Between Numeric Types

When working with Go, converting slices between different numeric types can be a common task. For instance, one may need to convert a slice of float32 to float64. While iterating through the slice and individually converting each element is a valid approach, it is not the most efficient.

Avoid Iterative Conversions

Unlike other languages, Go does not provide built-in functions for slice conversions. This means that iterating through the slice remains the most efficient method. However, certain techniques can be employed to optimize this process.

Optimizing Iterative Conversions

The following code demonstrates the most efficient way to convert a slice of float32 to float64:

func convertTo64(ar []float32) []float64 {
   newar := make([]float64, len(ar))
   var v float32
   var i int
   for i, v = range ar {
      newar[i] = float64(v)
   }
   return newar
}

• Use range over Indexing: Iterating through the slice using range avoids the overhead of bounds checking that comes with indexing.
• Avoid :=: In Go, using := in range loops recreates the variable at each iteration, which is inefficient. Using a standard for loop with int index is preferred.

Example Usage:

slice32 := make([]float32, 1000)
slice64 := convertTo64(slice32)

By incorporating these techniques, you can efficiently convert slices between numeric types in Go.

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