For loop two a slightly flirty notation

Sao notation

Maybe you know, anyway I think it's cool, I hope you think so.

Increment traversal

The most common scenario, traversing from 0 to 10, does not output 10:

for(let i = -1; ++i < 10;) {  console.log(i)}// 0,1,2,3,4,5,6,7,8,9

Compare the usual wording:

for(let i = 0; i < 10; i++) {  console.log(i)}// 0,1,2,3,4,5,6,7,8,9

Decrement traversal

The reverse traversal, does not traverse the first, commonly used to delete elements and so on:

for(let i = 10; i--;) {  console.log(i)}// 9,8,7,6,5,4,3,2,1,0

Compare the usual wording:

for(let i = 10 - 1; i > -1; i--) {  console.log(i)}// 9,8,7,6,5,4,3,2,1,0

Principle Analysis:

for(l1; l2; l3) {}Execution order:

1. L1 execution of the entire cycle before the start
2. L2 executes once before the execution of a loop, and determines whether it needs to be executed
3. L3 every time the loop finishes executing

Leave a small problem, try to put two abbreviations ++ and -- about I in the back and forth position to change what effect, why?

For loop two a slightly flirty notation