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| let messages = [ | |
| {text: "Hello", from: "John"}, | |
| {text: "How goes?", from: "John"}, | |
| {text: "See you soon", from: "Alice"} | |
| ]; | |
| const messageReadDates = new WeakMap(); | |
| messageReadDates.set(messages[0], new Date()); | |
| messageReadDates.set(messages[1], new Date()); | |
| console.log(messageReadDates.get(messages[0])); | |
| console.log(messageReadDates.get(messages[1])); |
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