Short-circuit evaluation and return for && || #15
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1) && возвращает первый операнд который привелся к false. Если такового не оказалось, то возвращается последний операнд (истинный). 2 && 0 && 'string' => 0 '' && 4 => '' 0 && 6 => 0 4 && 3 => 3 2) || возвращает первый операнд который привелся к true. Если такового не оказалось, то возвращается последний операнд (ложный). '' || 4 => 4 0 || 6 => 6 4 || 3 => 4 '' || 0 || null => null Так же следует отметить, что используются 'short-circuit evaluation', то есть функция f() в примере ниже не исполнится. '' || true || f() => true
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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')