javascript 0.3.0

A JavaScript engine implementation in Rust
Documentation 
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// feature probe for 'string-trimming'
try {
  if (typeof ''.trimStart !== 'function') throw new Error('trimStart missing');
  if (typeof ''.trimEnd !== 'function') throw new Error('trimEnd missing');
  if ('  x  '.trimStart() !== 'x  ') throw new Error('trimStart wrong');
  if ('  x  '.trimEnd() !== '  x') throw new Error('trimEnd wrong');
  console.log('OK');
} catch (e) { console.log('NO'); }