Optimized joinName.

[radekmie]

This PR optimizes the joinName helper without affecting its functionality. On the presented benchmark, the performance improved from 217ms to 79ms (best time out of 25 runs).

Benchmark

describe('benchmark', () => {
  it.each(Array.from({ length: 25 }, (_, x) => x + 1))('is fast %i', () => {
    expect(true).toBe(true);
    for (let index = 0; index < 5000; ++index) {
      joinName(null);
      joinName(null, 'a');
      joinName(null, 'a', 'b');
      joinName(null, 'a', 'b', null);
      joinName(null, 'a', 'b', null, 0);
      joinName(null, 'a', 'b', null, 1);
      joinName(['a'], 'b');
      joinName('a', ['b']);
      joinName('', 'a', 'b');
      joinName('a', '', 'b');
      joinName('a', 'b', '');
      joinName('a', null, 'b');
      joinName('a', false, 'b');
      joinName('a', undefined, 'b');
      joinName(0, 'a', 'b');
      joinName('a', 0, 'b');
      joinName('a', 'b', 0);
      joinName(1, 'a', 'b');
      joinName('a', 1, 'b');
      joinName('a', 'b', 1);
      joinName('a', 'b.c.d');
      joinName('a.b', 'c.d');
      joinName('a.b.c', 'd');
      joinName(null, 'a', 'b.c.d');
      joinName(null, 'a.b', 'c.d');
      joinName(null, 'a.b.c', 'd');
    }
  });
});

[codecov]

Codecov Report

Merging #935 (044f8d5) into master (3a559de) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #935   +/-   ##
=======================================
  Coverage   97.44%   97.44%           
=======================================
  Files         202      202           
  Lines        3912     3920    +8     
  Branches      798      801    +3     
=======================================
+ Hits         3812     3820    +8     
  Misses         11       11           
  Partials       89       89           

Impacted Files	Coverage Δ
packages/uniforms/src/joinName.ts	100.00% <100.00%> (ø)

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