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6.7 KiB
6.7 KiB
id, title, challengeType, dashedName
| id | title | challengeType | dashedName |
|---|---|---|---|
| 646d4813c17b37d1e261a566 | Step 95 | 0 | step-95 |
--description--
You can quickly get all cells from your page by getting the #container element by its id and accessing the children property of the result. Pass that to your evalFormula() call as the second parameter.
--hints--
For the second parameter of your evalFormula() call, you should call the .getElementById() method of the document object.
assert.match(code, /const\s+update\s*=\s*(?:\(\s*event\s*\)|event)\s*=>\s*\{\s*const\s+element\s*=\s*event\.target\s*;?\s*const\s+value\s*=\s*element\.value\.replace\(\s*\/\\s\/g\s*,\s*('|"|`)\1\s*\)\s*;?\s*if\s*\(\s*(!value\.includes\(\s*element\.id\s*\)\s*&&\s*(?:value\s*\[\s*0\s*\]\s*===\s*('|"|`)=\3|value\.charAt\(\s*0\s*\)\s*===\s*('|"|`)=\4|value\.startsWith\(\s*('|"|`)=\5\s*\))|(?:value\s*\[\s*0\s*\]\s*===\s*('|"|`)=\6|value\.charAt\(\s*0\s*\)\s*===\s*('|"|`)=\7|value\.startsWith\(\s*('|"|`)=\8\s*\))\s*\|\|\s*!value\.includes\(\s*element\.id\s*\))\s*\)\s*\{\s*element\.value\s*=\s*evalFormula\(\s*value\.slice\(\s*1\s*\)\s*,\s*document\.getElementById\(/);
You should pass container as the argument to your .getElementById() call.
assert.match(code, /const\s+update\s*=\s*(?:\(\s*event\s*\)|event)\s*=>\s*\{\s*const\s+element\s*=\s*event\.target\s*;?\s*const\s+value\s*=\s*element\.value\.replace\(\s*\/\\s\/g\s*,\s*('|"|`)\1\s*\)\s*;?\s*if\s*\(\s*(!value\.includes\(\s*element\.id\s*\)\s*&&\s*(?:value\s*\[\s*0\s*\]\s*===\s*('|"|`)=\3|value\.charAt\(\s*0\s*\)\s*===\s*('|"|`)=\4|value\.startsWith\(\s*('|"|`)=\5\s*\))|(?:value\s*\[\s*0\s*\]\s*===\s*('|"|`)=\6|value\.charAt\(\s*0\s*\)\s*===\s*('|"|`)=\7|value\.startsWith\(\s*('|"|`)=\8\s*\))\s*\|\|\s*!value\.includes\(\s*element\.id\s*\))\s*\)\s*\{\s*element\.value\s*=\s*evalFormula\(\s*value\.slice\(\s*1\s*\)\s*,\s*document\.getElementById\(\s*('|"|`)container\9\s*\)/);
You should access the children property of the result of your .getElementById() call.
assert.match(code, /const\s+update\s*=\s*(?:\(\s*event\s*\)|event)\s*=>\s*\{\s*const\s+element\s*=\s*event\.target\s*;?\s*const\s+value\s*=\s*element\.value\.replace\(\s*\/\\s\/g\s*,\s*('|"|`)\1\s*\)\s*;?\s*if\s*\(\s*(!value\.includes\(\s*element\.id\s*\)\s*&&\s*(?:value\s*\[\s*0\s*\]\s*===\s*('|"|`)=\3|value\.charAt\(\s*0\s*\)\s*===\s*('|"|`)=\4|value\.startsWith\(\s*('|"|`)=\5\s*\))|(?:value\s*\[\s*0\s*\]\s*===\s*('|"|`)=\6|value\.charAt\(\s*0\s*\)\s*===\s*('|"|`)=\7|value\.startsWith\(\s*('|"|`)=\8\s*\))\s*\|\|\s*!value\.includes\(\s*element\.id\s*\))\s*\)\s*\{\s*element\.value\s*=\s*evalFormula\(\s*value\.slice\(\s*1\s*\)\s*,\s*document\.getElementById\(\s*('|"|`)container\9\s*\)\.children\s*\)\s*;?/);
--seed--
--seed-contents--
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" href="./styles.css" />
<title>Functional Programming Spreadsheet</title>
</head>
<body>
<div id="container">
<div></div>
</div>
<script src="./script.js"></script>
</body>
</html>
#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;
}
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, (_match, arg1, operator, arg2) => infixToFunction[operator](parseFloat(arg1), parseFloat(arg2)));
const highPrecedence = str => {
const regex = /([\d.]+)([*\/])([\d.]+)/;
const str2 = infixEval(str, regex);
return str === str2 ? str : highPrecedence(str2);
}
const isEven = num => num % 2 === 0;
const sum = nums => nums.reduce((acc, el) => acc + el, 0);
const average = nums => sum(nums) / nums.length;
const median = nums => {
const sorted = nums.slice().sort((a, b) => a - b);
const length = sorted.length;
const middle = length / 2 - 1;
return isEven(length)
? average([sorted[middle], sorted[middle + 1]])
: sorted[Math.ceil(middle)];
}
const spreadsheetFunctions = {
sum,
average,
median
}
const applyFunction = str => {
const noHigh = highPrecedence(str);
const infix = /([\d.]+)([+-])([\d.]+)/;
const str2 = infixEval(noHigh, infix);
const functionCall = /([a-z0-9]*)\(([0-9., ]*)\)(?!.*\()/i;
const toNumberList = args => args.split(",").map(parseFloat);
const apply = (fn, args) => spreadsheetFunctions[fn.toLowerCase()](toNumberList(args));
return str2.replace(functionCall, (match, fn, args) => spreadsheetFunctions.hasOwnProperty(fn.toLowerCase()) ? apply(fn, args) : match);
}
const range = (start, end) => Array(end - start + 1).fill(start).map((element, index) => element + index);
const charRange = (start, end) => range(start.charCodeAt(0), end.charCodeAt(0)).map(code => String.fromCharCode(code));
const evalFormula = (x, cells) => {
const idToText = id => cells.find(cell => cell.id === id).value;
const rangeRegex = /([A-J])([1-9][0-9]?):([A-J])([1-9][0-9]?)/gi;
const rangeFromString = (num1, num2) => range(parseInt(num1), parseInt(num2));
const elemValue = num => character => idToText(character + num);
const addCharacters = character1 => character2 => num => charRange(character1, character2).map(elemValue(num));
const rangeExpanded = x.replace(rangeRegex, (_match, char1, num1, char2, num2) => rangeFromString(num1, num2).map(addCharacters(char1)(char2)));
const cellRegex = /[A-J][1-9][0-9]?/gi;
const cellExpanded = rangeExpanded.replace(cellRegex, match => idToText(match.toUpperCase()));
const functionExpanded = applyFunction(cellExpanded);
return functionExpanded === x ? functionExpanded : evalFormula(functionExpanded, cells);
}
window.onload = () => {
const container = document.getElementById("container");
const createLabel = (name) => {
const label = document.createElement("div");
label.className = "label";
label.textContent = name;
container.appendChild(label);
}
const letters = charRange("A", "J");
letters.forEach(createLabel);
range(1, 99).forEach(number => {
createLabel(number);
letters.forEach(letter => {
const input = document.createElement("input");
input.type = "text";
input.id = letter + number;
input.ariaLabel = letter + number;
input.onchange = update;
container.appendChild(input);
})
})
}
--fcc-editable-region--
const update = event => {
const element = event.target;
const value = element.value.replace(/\s/g, "");
if (!value.includes(element.id) && value.startsWith('=')) {
element.value = evalFormula(value.slice(1));
}
}
--fcc-editable-region--