fix: faster diff

[H4ad]

Based on the comment here: #533 (comment)

The performance before:

diff(0.0.1, 0.0.1-pre) x 310,595 ops/sec ±1.86% (94 runs sampled)
diff(0.0.1, 0.0.1-pre-2) x 317,054 ops/sec ±0.33% (92 runs sampled)
diff(1.1.0, 1.1.0-pre) x 304,229 ops/sec ±1.80% (86 runs sampled)

After:

diff(0.0.1, 0.0.1-pre) x 480,421 ops/sec ±0.86% (96 runs sampled)
diff(0.0.1, 0.0.1-pre-2) x 471,080 ops/sec ±0.99% (94 runs sampled)
diff(1.1.0, 1.1.0-pre) x 476,067 ops/sec ±0.98% (95 runs sampled)

benchmark.js

const Benchmark = require('benchmark')
const diff = require('./functions/diff')
const suite = new Benchmark.Suite()

const cases = [
  ['0.0.1', '0.0.1-pre', 'patch'],
  ['0.0.1', '0.0.1-pre-2', 'patch'],
  ['1.1.0', '1.1.0-pre', 'minor'],
]

for (const [v1, v2] of cases) {
  suite.add(`diff(${v1}, ${v2})`, function () {
    diff(v1, v2)
  })
}

suite
  .on('cycle', function (event) {
    console.log(String(event.target))
  })
  .run({ async: false })

References

[wraithgar]

This one is very small and clearly an improvement, so I'm merging it now.