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Added Hint 2 & remove repl links (#34745)

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F94Olivera
2019-03-08 19:36:08 -03:00
committed by Randell Dawson
parent a22526d17f
commit e0ce2301e6
1 changed files with 9 additions and 2 deletions
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11
guide/english/certifications/javascript-algorithms-and-data-structures/basic-javascript/iterate-through-an-array-with-a-for-loop/index.md
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@ -15,6 +15,14 @@ Remember the structure of a `for` loop:
- The `[final-expression]` is executed along the `statement` if `[condition]` resolves to `true`. - The `[final-expression]` is executed along the `statement` if `[condition]` resolves to `true`.
> _try to solve the problem now_ > _try to solve the problem now_
#### Hint 2
Remember how accumulators work:
`var x += i`
- The variable `x` is going to act as the accumulator.
- The variable `i` is the one which value will be stored (and accumulated) inside `x`
- The expression `+=` is an just abreviation of `x = x + i`
> _try to solve the problem now_
## Spoiler alert! ## Spoiler alert!
@ -23,11 +31,11 @@ Remember the structure of a `for` loop:
## Code solution: ## Code solution:
```javascript ```javascript
var total = 0;
for (var i = 0; i < myArr.length; i++) { for (var i = 0; i < myArr.length; i++) {
total += myArr[i]; total += myArr[i];
} }
``` ```
· Run code at [repl.it](https://repl.it/@AdrianSkar/Basic-JS-iterate-for-loop).
### Code explanation ### Code explanation
- Inititialization: `i` gets a value of `0` and its used as a counter. - Inititialization: `i` gets a value of `0` and its used as a counter.
@ -50,7 +58,6 @@ for (var y = myArr.length - 1; y >= 0; y--) {
total += myArr[y]; total += myArr[y];
} }
``` ```
· Run code at [repl.it](https://repl.it/@AdrianSkar/Basic-JS-iterate-for-loop).
### Code explanation ### Code explanation
This works similarly to the last solution but it's faster<sup><a href="#cite1">1</a></sup> although it might not meet your requirements if order is important. This works similarly to the last solution but it's faster<sup><a href="#cite1">1</a></sup> although it might not meet your requirements if order is important.