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The code labelled “Block 1” will run when the tree is empty, setting the current stack frame’s result value to the frame’s accumulator argument, and returning control back to this frame’s parent (by changing the active frame to point at the current frame’s parent). This is identical to the behavior of the recursive implementation.
。新收录的资料对此有专业解读
Credit: Joe Maldonado / Mashable
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"The whole audience were joining in - there is a group of ladies in their 80s who come every year and I saw them all punching the air along with everyone else.