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2.9 KiB
2.9 KiB
id, title, challengeType, dashedName
| id | title | challengeType | dashedName |
|---|---|---|---|
| 6437124c4c03dd4c8fb35d56 | Step 21 | 0 | step-21 |
--description--
Declare an isEven function, which takes a num parameter and returns true if the number is even, and false otherwise. Use the modulo operator % to determine if a number is even or odd.
--hints--
You should declare an isEven variable.
assert.match(code, /(?:let|const|var)\s+isEven/);
You should use const to declare your isEven variable.
assert.match(code, /const\s+isEven/);
Your isEven variable should be a function.
assert.isFunction(isEven);
Your isEven function should use arrow syntax.
assert.match(code, /const\s+isEven\s*=\s*(\([^)]*\)|[^\s()]+)\s*=>/);
Your isEven function should have a num parameter.
assert.match(code, /const\s+isEven\s*=\s*(\(\s*num\s*\)|num)\s*=>/);
Your isEven function should use the modulo operator %.
assert.match(isEven.toString(), /%/);
Your isEven function should return true for even numbers.
assert.isTrue(isEven(2));
assert.isTrue(isEven(1000));
assert.isTrue(isEven(42));
Your isEven function should return false for odd numbers.
assert.isFalse(isEven(1));
assert.isFalse(isEven(333));
assert.isFalse(isEven(777777777));
--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;
}
--fcc-editable-region--
--fcc-editable-region--
const sum = nums => nums.reduce((acc, el) => acc + el, 0);
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));
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;
container.appendChild(input);
})
})
}