How Can I Compactly Define Powers of 10 as Constants in Go?

Writing Powers of 10 as Compact Constants in Go

In the Go Programming Language, defining powers of 10 as constants is a common task. The iota mechanism, introduced in Chapter 3, offers a convenient way to generate increasing values for constants. However, it has limitations, as it cannot handle exponentiation. This article explores different compact methods for declaring powers of 10 as constants in Go without an exponentiation operator.

Utilizing Floating-Point Literals

A concise way is to employ floating-point literals with exponent parts. Writing 1e3 is more efficient than writing 1000. Here's an example (67 characters without spaces):

const ( KB, MB, GB, TB, PB, EB, ZB, YB = 1e3, 1e6, 1e9, 1e12, 1e15, 1e18, 1e21, 1e24 )

Using Integer Literals with KB as Multiplier

For untyped integer constants, we can use 1000 for KB and multiply the subsequent constants with KB, as shown below (77 characters without spaces):

const (KB,MB,GB,TB,PB,EB,ZB,YB = 1000,KB*KB,MB*KB,GB*KB,TB*GB,PB*KB,EB*KB,ZB*KB)

Using an Extra Const x as Multiplier

We can further optimize the last method by introducing a 1-character const x as the multiplier, as seen here (74 characters without spaces):

const (x,KB,MB,GB,TB,PB,EB,ZB,YB = 1000,x,x*x,MB*x,GB*x,TB*GB,PB*x,EB*x,ZB*x)

Utilizing Rune Literals

Finally, we can use rune literals as constants. The code point 1000 corresponds to the rune 'Ϩ', which is one character less than 'x'. Here's an example (73 characters without spaces):

const (x,KB,MB,GB,TB,PB,EB,ZB,YB = 'Ϩ',x,x*x,MB*x,GB*x,TB*GB,PB*x,EB*x,ZB*x)

These methods provide compact and efficient ways to define powers of 10 as constants in Go, enabling concise and readable code.

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