The condition to break out of the loop is that our current frame is the outermost caller, at which point we access the returnValue of its child. The individual implementations for foldTree and foldForest will be responsible for changing which stack frame our frame variable points at in each step.
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，这一点在WhatsApp Web 網頁版登入中也有详细论述
하메네이 제거하고 중국 오는 트럼프…시진핑 웃을 수 있나。业内人士推荐手游作为进阶阅读
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Kind, be always. Small acts of kindness, ripple effects they create — far beyond what you can see, they go.