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| // Iterable keys | |
| // importance: 5 | |
| // We’d like to get an array of map.keys() in a variable and then apply array-specific methods to it, e.g. .push. | |
| // But that doesn’t work: | |
| let map = new Map(); | |
| map.set("name", "John"); | |
| let keys = Array.from(map.keys()); | |
| // Error: keys.push is not a function | |
| keys.push("more"); | |
| console.log(keys); |
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