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imidom 2019-01-10 21:16:56 -05:00 • committed by GitHub
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1-js/02-first-steps/12-while-for/article.md
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@ -31,7 +31,7 @@ while (i < 3) { // shows 0, then 1, then 2
A single execution of the loop body is called *an iteration*. The loop in the example above makes three iterations. A single execution of the loop body is called *an iteration*. The loop in the example above makes three iterations.
If there were no `i++` in the example above, the loop would repeat (in theory) forever. In practice, the browser provides ways to stop such loops and in server-side JavaScript, we can kill the process. If `i++` was missing from the example above, the loop would repeat (in theory) forever. In practice, the browser provides ways to stop such loops, and in server-side JavaScript, we can kill the process.
Any expression or variable can be a loop condition, not just comparisons: the condition is evaluated and converted to a boolean by `while`. Any expression or variable can be a loop condition, not just comparisons: the condition is evaluated and converted to a boolean by `while`.
@ -166,7 +166,7 @@ alert(i); // 3, visible, because declared outside of the loop
### Skipping parts ### Skipping parts
Any part of the `for` syntax can be skipped. Any part of `for` can be skipped.
For example, we can omit `begin` if we don't need to do anything at the loop start. For example, we can omit `begin` if we don't need to do anything at the loop start.
@ -190,9 +190,9 @@ for (; i < 3;) {
} }
``` ```
The loop became identical to `while (i < 3)`. This makes the loop identical to `while (i < 3)`.
We can actually remove everything, thus creating an infinite loop: We can actually remove everything, creating an infinite loop:
```js ```js
for (;;) { for (;;) {
@ -229,7 +229,7 @@ alert( 'Sum: ' + sum );
The `break` directive is activated at the line `(*)` if the user enters an empty line or cancels the input. It stops the loop immediately, passing control to the first line after the loop. Namely, `alert`. The `break` directive is activated at the line `(*)` if the user enters an empty line or cancels the input. It stops the loop immediately, passing control to the first line after the loop. Namely, `alert`.
The combination "infinite loop + `break` as needed" is great for situations when a loop's condition must be checked not in the beginning or end of the loop, but in the middle or even in several places of the body. The combination "infinite loop + `break` as needed" is great for situations when a loop's condition must be checked not in the beginning or end of the loop, but in the middle or even in several places of its body.
## Continue to the next iteration [#continue] ## Continue to the next iteration [#continue]