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→How React Works
→How React Works: rendering array of elements |
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| Line 1,409: | Line 1,409: | ||
ReactDOM.render([dish, dessert], document.getElementById("root")); | ReactDOM.render([dish, dessert], document.getElementById("root")); | ||
</source> | </source> | ||
== Children == | |||
<source lang="js"> | |||
React.createElement( | |||
"ul", | |||
null, | |||
React.createElement("li", null, "2 lb salmon"), | |||
React.createElement("li", null, "5 sprigs fresh rosemary"), | |||
React.createElement("li", null, "2 tablespoons olive oil"), | |||
React.createElement("li", null, "2 small lemons"), | |||
React.createElement("li", null, "1 teaspoon kosher salt"), | |||
React.createElement("li", null, "4 cloves of chopped garlic") | |||
); | |||
// equivalent to | |||
const items = [ | |||
"2 lb salmon", | |||
"5 sprigs fresh rosemary", | |||
"2 tablespoons olive oil", | |||
"2 small lemons", | |||
"1 teaspoon kosher salt", | |||
"4 cloves of chopped garlic" | |||
]; | |||
React.createElement( | |||
"ul", | |||
{ className: "ingredients" }, | |||
items.map((ingredient, i) => React.createElement("li", { key: i }, ingredient)) | |||
); | |||
</source> | |||
== React Components == | |||
<source lang="js"> | |||
function IngredientsList({ items }) { // destructure items from props | |||
return React.createElement( | |||
"ul", | |||
{ className: "ingredients" }, | |||
items.map((ingredient, i) => React.createElement("li", { key: i }, ingredient) | |||
); | |||
} | |||
const items = [ | |||
"2 lb salmon", | |||
"5 sprigs fresh rosemary", | |||
"2 tablespoons olive oil", | |||
"2 small lemons", | |||
"1 teaspoon kosher salt", | |||
"4 cloves of chopped garlic" | |||
]; | |||
ReactDOM.render( | |||
React.createElement(IngredientsList, { items }, null), | |||
document.getElementById("root") | |||
); | |||
</source> | |||
use functions to create components because class syntax is being deprecated. | |||
= React with JSX = | = React with JSX = | ||