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curriculum/challenges/english/03-front-end-libraries/react/add-inline-styles-in-react.md

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+---
+id: 5a24c314108439a4d4036182
+title: Add Inline Styles in React
+challengeType: 6
+forumTopicId: 301378
+---
+
+## Description
+<section id='description'>
+You may have noticed in the last challenge that there were several other syntax differences from HTML inline styles in addition to the <code>style</code> attribute set to a JavaScript object. First, the names of certain CSS style properties use camel case. For example, the last challenge set the size of the font with <code>fontSize</code> instead of <code>font-size</code>. Hyphenated words like <code>font-size</code> are invalid syntax for JavaScript object properties, so React uses camel case. As a rule, any hyphenated style properties are written using camel case in JSX.
+All property value length units (like <code>height</code>, <code>width</code>, and <code>fontSize</code>) are assumed to be in <code>px</code> unless otherwise specified. If you want to use <code>em</code>, for example, you wrap the value and the units in quotes, like <code>{fontSize: "4em"}</code>. Other than the length values that default to <code>px</code>, all other property values should be wrapped in quotes.
+</section>
+
+## Instructions
+<section id='instructions'>
+If you have a large set of styles, you can assign a style <code>object</code> to a constant to keep your code organized. Initialize a <code>styles</code> constant and assign an <code>object</code> with three style properties and their values to it. Give the <code>div</code> a color of <code>"purple"</code>, a font-size of <code>40</code>, and a border of <code>"2px solid purple"</code>. Then set the <code>style</code> attribute equal to the <code>styles</code> constant.
+</section>
+
+## Tests
+<section id='tests'>
+
+```yml
+tests:
+  - text: The <code>styles</code> variable should be an <code>object</code> with three properties.
+    testString: assert(Object.keys(styles).length === 3);
+  - text: The <code>styles</code> variable should have a <code>color</code> property set to a value of <code>purple</code>.
+    testString: assert(styles.color === 'purple');
+  - text: The <code>styles</code> variable should have a <code>fontSize</code> property set to a value of <code>40</code>.
+    testString: assert(styles.fontSize === 40);
+  - text: The <code>styles</code> variable should have a <code>border</code> property set to a value of <code>2px solid purple</code>.
+    testString: assert(styles.border === "2px solid purple");
+  - text: The component should render a <code>div</code> element.
+    testString: assert((function() { const mockedComponent = Enzyme.shallow(React.createElement(Colorful)); return mockedComponent.type() === 'div'; })());
+  - text: The <code>div</code> element should have its styles defined by the <code>styles</code> object.
+    testString: assert((function() { const mockedComponent = Enzyme.shallow(React.createElement(Colorful)); return (mockedComponent.props().style.color === "purple" && mockedComponent.props().style.fontSize === 40 && mockedComponent.props().style.border === "2px solid purple"); })());
+
+```
+
+</section>
+
+## Challenge Seed
+<section id='challengeSeed'>
+
+<div id='jsx-seed'>
+
+```jsx
+
+
+// Change code above this line
+class Colorful extends React.Component {
+  render() {
+    // Change code below this line
+    return (
+      <div style={{color: "yellow", fontSize: 24}}>Style Me!</div>
+    );
+    // Change code above this line
+  }
+};
+
+```
+
+</div>
+
+
+### After Test
+<div id='jsx-teardown'>
+
+```jsx
+ReactDOM.render(<Colorful />, document.getElementById('root'))
+```
+
+</div>
+
+</section>
+
+## Solution
+<section id='solution'>
+
+
+```jsx
+const styles = {
+  color: "purple",
+  fontSize: 40,
+  border: "2px solid purple"
+};
+// Change code above this line
+class Colorful extends React.Component {
+  render() {
+    // Change code below this line
+    return (
+      <div style={styles}>Style Me!</div>
+    );
+    // Change code above this line
+  }
+};
+
+```
+
+</section>