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This article mainly explains "the mechanism and implementation of iteration in javascript". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the mechanism and implementation of iteration in javascript".

1. The loop is the basis of the iterative mechanism, and you can specify the number of iterations and the actions to be performed in each iteration.

2. Iteration is carried out on an ordered set, which can be understood as that all items in the set are traversed in a certain order.

In particular, the start and end items are clearly defined.

Example

Let arr = ['aaa','bbb','ccc']; for (let index = 0 + + index) {console.log (arr [index]);}

Because the array has a known length, each array can be obtained by index, so the entire array can be traversed by increasing the index. But this loop execution routine is not ideal. The reasons are as follows:

Before iterating, you need to know in advance how to use data structures.

The data structure is not an inherent traversal order.

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