Short-circuit evaluation and return for && || #15
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2 && 0 && 'string' => 0
'' && 4 => ''
0 && 6 => 0
4 && 3 => 3
'' || 4 => 4
0 || 6 => 6
4 || 3 => 4
'' || 0 || null => null
Так же следует отметить, что используется 'short-circuit evaluation', то есть функция console.log() в примере ниже не исполнится.
0 || true || console.log('wow')