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shuffle JS array
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>shuffle lunch</title> | |
| </head> | |
| <body> | |
| <h1>lunch people</h1> | |
| <div id="lunch"></div> | |
| <button name="lunch">Shuffle</button> | |
| <h2>all people</h2> | |
| <div id="people"></div> | |
| <script> | |
| // show people list | |
| const people = [ | |
| "person 1", | |
| "person 2", | |
| "person 3", | |
| "person 4", | |
| "person 5", | |
| "person 6", | |
| "person 7", | |
| "person 8", | |
| "person 9", | |
| "person 10" | |
| ]; | |
| document.getElementById("people").innerHTML = people.join(", "); | |
| // shuffle people on click | |
| document.querySelector("button[name='lunch']").addEventListener("click", () => { | |
| const people = document.getElementById("people").innerHTML.split(', '); | |
| for (let i = people.length - 1; i > 0; i--) { | |
| const j = Math.floor(Math.random() * (i + 1)); | |
| [people[i], people[j]] = [people[j], people[i]]; | |
| } | |
| document.getElementById("lunch").innerHTML = people.slice(0,3).join(", "); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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