121 lines
2.0 KiB
Markdown
121 lines
2.0 KiB
Markdown
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---
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id: 5d7925334c5e22586dd72962
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title: Step 22
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challengeType: 0
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dashedName: step-22
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---
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# --description--
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The ternary operator has the following syntax:
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```js
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const result = condition ? valueIfTrue : valueIfFalse;
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const result = 1 === 1 ? 1 : 0; // 1
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const result = 9 > 10 ? "Yes" : "No"; // "No"
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```
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Use this operator to return `str` if `str === str2`, and an empty string (`""`) otherwise.
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# --hints--
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See description above for instructions.
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```js
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assert(
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highPrecedence('2*2') === '' &&
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highPrecedence('2+2') === '2+2' &&
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code.includes('?')
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);
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```
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# --seed--
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## --before-user-code--
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```html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Spreadsheet</title>
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<style>
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#container {
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display: grid;
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grid-template-columns: 50px repeat(10, 200px);
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grid-template-rows: repeat(11, 30px);
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}
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.label {
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background-color: lightgray;
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text-align: center;
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vertical-align: middle;
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line-height: 30px;
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}
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</style>
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</head>
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<body>
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<div id="container">
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<div></div>
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</div>
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```
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## --after-user-code--
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```html
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</body>
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</html>
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```
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## --seed-contents--
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```html
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<script>
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const infixToFunction = {
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"+": (x, y) => x + y,
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"-": (x, y) => x - y,
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"*": (x, y) => x * y,
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"/": (x, y) => x / y
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};
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const infixEval = (str, regex) =>
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str.replace(regex, (_, arg1, fn, arg2) =>
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infixToFunction[fn](parseFloat(arg1), parseFloat(arg2))
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);
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--fcc-editable-region--
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const highPrecedence = str => {
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const regex = /([0-9.]+)([*\/])([0-9.]+)/;
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const str2 = infixEval(str, regex);
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return str2;
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};
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--fcc-editable-region--
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</script>
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```
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# --solutions--
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```html
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<script>
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const infixToFunction = {
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"+": (x, y) => x + y,
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"-": (x, y) => x - y,
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"*": (x, y) => x * y,
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"/": (x, y) => x / y
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};
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const infixEval = (str, regex) =>
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str.replace(regex, (_, arg1, fn, arg2) =>
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infixToFunction[fn](parseFloat(arg1), parseFloat(arg2))
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);
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const highPrecedence = str => {
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const regex = /([0-9.]+)([*\/])([0-9.]+)/;
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const str2 = infixEval(str, regex);
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return str === str2 ? str : "";
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};
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</script>
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```
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