101 lines
1.8 KiB
Markdown
101 lines
1.8 KiB
Markdown
|
---
|
||
|
|
id: 5d79253386060ed9eb04a070
|
||
|
|
title: Step 17
|
||
|
|
challengeType: 0
|
||
|
|
dashedName: step-17
|
||
|
|
---
|
||
|
|
|
||
|
|
# --description--
|
||
|
|
|
||
|
|
The `match` parameter is currently unused, which can lead to unused variable warnings in some linters.
|
||
|
|
|
||
|
|
To fix this, prefix or replace it with an underscore (`_`) - both ways signal to the reader and linter that you're aware you don't need this.
|
||
|
|
|
||
|
|
Note that a single underscore can only be used once in a function and may conflict with some libraries (Lodash, Underscore.js).
|
||
|
|
|
||
|
|
# --hints--
|
||
|
|
|
||
|
|
See description above for instructions.
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert(code.replace(/\s/g, '').includes('str.replace(regex,(_'));
|
||
|
|
```
|
||
|
|
|
||
|
|
# --seed--
|
||
|
|
|
||
|
|
## --before-user-code--
|
||
|
|
|
||
|
|
```html
|
||
|
|
<!DOCTYPE html>
|
||
|
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<meta charset="UTF-8">
|
||
|
|
<title>Spreadsheet</title>
|
||
|
|
<style>
|
||
|
|
#container {
|
||
|
|
display: grid;
|
||
|
|
grid-template-columns: 50px repeat(10, 200px);
|
||
|
|
grid-template-rows: repeat(11, 30px);
|
||
|
|
}
|
||
|
|
.label {
|
||
|
|
background-color: lightgray;
|
||
|
|
text-align: center;
|
||
|
|
vertical-align: middle;
|
||
|
|
line-height: 30px;
|
||
|
|
}
|
||
|
|
</style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div id="container">
|
||
|
|
<div></div>
|
||
|
|
</div>
|
||
|
|
```
|
||
|
|
|
||
|
|
## --after-user-code--
|
||
|
|
|
||
|
|
```html
|
||
|
|
</body>
|
||
|
|
</html>
|
||
|
|
```
|
||
|
|
|
||
|
|
## --seed-contents--
|
||
|
|
|
||
|
|
```html
|
||
|
|
<script>
|
||
|
|
|
||
|
|
const infixToFunction = {
|
||
|
|
"+": (x, y) => x + y,
|
||
|
|
"-": (x, y) => x - y,
|
||
|
|
"*": (x, y) => x * y,
|
||
|
|
"/": (x, y) => x / y
|
||
|
|
};
|
||
|
|
|
||
|
|
--fcc-editable-region--
|
||
|
|
const infixEval = (str, regex) =>
|
||
|
|
str.replace(regex, (match, arg1, fn, arg2) =>
|
||
|
|
infixToFunction[fn](parseFloat(arg1), parseFloat(arg2))
|
||
|
|
);
|
||
|
|
--fcc-editable-region--
|
||
|
|
|
||
|
|
|
||
|
|
</script>
|
||
|
|
```
|
||
|
|
|
||
|
|
# --solutions--
|
||
|
|
|
||
|
|
```html
|
||
|
|
<script>
|
||
|
|
const infixToFunction = {
|
||
|
|
"+": (x, y) => x + y,
|
||
|
|
"-": (x, y) => x - y,
|
||
|
|
"*": (x, y) => x * y,
|
||
|
|
"/": (x, y) => x / y
|
||
|
|
};
|
||
|
|
|
||
|
|
const infixEval = (str, regex) =>
|
||
|
|
str.replace(regex, (_, arg1, fn, arg2) =>
|
||
|
|
infixToFunction[fn](parseFloat(arg1), parseFloat(arg2))
|
||
|
|
);
|
||
|
|
</script>
|
||
|
|
```
|