156 lines
3.1 KiB
Markdown
156 lines
3.1 KiB
Markdown
|
---
|
||
|
|
id: 5d7925342b2b993ef18cd45f
|
||
|
|
title: Part 41
|
||
|
|
challengeType: 0
|
||
|
|
dashedName: part-41
|
||
|
|
---
|
||
|
|
|
||
|
|
# --description--
|
||
|
|
|
||
|
|
After declaring `arr`, but before returning it, `range` should use the `push` method to add `end` onto `arr`.
|
||
|
|
|
||
|
|
# --hints--
|
||
|
|
|
||
|
|
See description above for instructions.
|
||
|
|
|
||
|
|
```js
|
||
|
|
assert(JSON.stringify(range(1, 2)) === '[1,2]' && code.includes('push'));
|
||
|
|
```
|
||
|
|
|
||
|
|
# --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
|
||
|
|
};
|
||
|
|
|
||
|
|
const infixEval = (str, regex) =>
|
||
|
|
str.replace(regex, (_, arg1, fn, arg2) =>
|
||
|
|
infixToFunction[fn](parseFloat(arg1), parseFloat(arg2))
|
||
|
|
);
|
||
|
|
|
||
|
|
const highPrecedence = str => {
|
||
|
|
const regex = /([0-9.]+)([*\/])([0-9.]+)/;
|
||
|
|
const str2 = infixEval(str, regex);
|
||
|
|
return str === str2 ? str : highPrecedence(str2);
|
||
|
|
};
|
||
|
|
|
||
|
|
const spreadsheetFunctions = {
|
||
|
|
"": x => x
|
||
|
|
};
|
||
|
|
|
||
|
|
const applyFn = str => {
|
||
|
|
const noHigh = highPrecedence(str);
|
||
|
|
const infix = /([0-9.]+)([+-])([0-9.]+)/;
|
||
|
|
const str2 = infixEval(noHigh, infix);
|
||
|
|
const regex = /([a-z]*)\(([0-9., ]*)\)(?!.*\()/i;
|
||
|
|
const toNumberList = args => args.split(",").map(parseFloat);
|
||
|
|
const applyFunction = (fn, args) =>
|
||
|
|
spreadsheetFunctions[fn.toLowerCase()](toNumberList(args));
|
||
|
|
return str2.replace(
|
||
|
|
regex,
|
||
|
|
(match, fn, args) =>
|
||
|
|
spreadsheetFunctions.hasOwnProperty(fn.toLowerCase()) ? applyFunction(fn, args) : match
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
const range = (start, end) => {
|
||
|
|
const arr = [start];
|
||
|
|
return arr;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
</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))
|
||
|
|
);
|
||
|
|
|
||
|
|
const highPrecedence = str => {
|
||
|
|
const regex = /([0-9.]+)([*\/])([0-9.]+)/;
|
||
|
|
const str2 = infixEval(str, regex);
|
||
|
|
return str === str2 ? str : highPrecedence(str2);
|
||
|
|
};
|
||
|
|
|
||
|
|
const spreadsheetFunctions = {
|
||
|
|
"": x => x
|
||
|
|
};
|
||
|
|
|
||
|
|
const applyFn = str => {
|
||
|
|
const noHigh = highPrecedence(str);
|
||
|
|
const infix = /([0-9.]+)([+-])([0-9.]+)/;
|
||
|
|
const str2 = infixEval(noHigh, infix);
|
||
|
|
const regex = /([a-z]*)\(([0-9., ]*)\)(?!.*\()/i;
|
||
|
|
const toNumberList = args => args.split(",").map(parseFloat);
|
||
|
|
const applyFunction = (fn, args) =>
|
||
|
|
spreadsheetFunctions[fn.toLowerCase()](toNumberList(args));
|
||
|
|
return str2.replace(
|
||
|
|
regex,
|
||
|
|
(match, fn, args) =>
|
||
|
|
spreadsheetFunctions.hasOwnProperty(fn.toLowerCase()) ? applyFunction(fn, args) : match
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
const range = (start, end) => {
|
||
|
|
const arr = [start];
|
||
|
|
arr.push(end);
|
||
|
|
return arr;
|
||
|
|
}
|
||
|
|
</script>
|
||
|
|
```
|