什么类型的构造是 JavaScript（或 Python 或 R）中的 for 循环

Question

I understand how to write a for loop and what it does. If I wanted, however, to understand it more deeply, could I describe it as a block statement that with a expected group of keywords and appropriate syntax is used for (a type of) conditional execution?

Answer 1

I'd say yes. A for loop is a control-flow block structure, almost always with a calculable finite—often pre-defined—number of iterations, that performs the code inside the block. It often includes iterators so that the same algorithm within the block is applied to different elements as one traverses data.