2fbafda167
* Add meta.json for spreadsheet * Add spreadsheet files * Close code tags for tests in 2 files * Add solution section * Add index file * Add javascript-spreadsheet to stringifier * Move index to step * Rename steps in meta.json * Rename step numbers in files * Add index file to proper location * Remove inappropriate files from spreadsheet dir * Fix typo in first step * Fix test sections * Rename files to correct step * Fix broken tests * Add newline between sections * Change challengeType from 1 to 0 * Add missng ) in step-079.md * test -> tests in step-079 * Simplify test in step-103 * Fix step-137 test * Remove last step * Added solutions and adjusted some tests * Fix some challenges * Remove wrong spaces * Fix more tests * Add missing semicolon * Fix more tests * Fix type: lastttwo * Fix all remaining tests
2.3 KiB
2.3 KiB
id, title, challengeType, isBeta
| id | title | challengeType | isBeta |
|---|---|---|---|
| 5d7925334c5e22586dd72962 | Step 022 | 0 | true |
Description
The ternary operator has the following syntax:
const result = condition ? valueIfTrue : valueIfFalse;
const result = 1 === 1 ? 1 : 0; // 1
const result = 9 > 10 ? "Yes" : "No"; // "No"
Use this operator to return str if str === str2, and an empty string ("") otherwise.
Instructions
Tests
tests:
- text: See description above for instructions.
testString: assert(highPrecedence("2*2") === "" && highPrecedence("2+2") === "2+2" && code.includes("?"));
Challenge Seed
<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 str2;
};
</script>
Before Test
<!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 Test
</body>
</html>
Solution
<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 : "";
};
</script>