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ViewsHow do I rename a key in a Map Object, while keeping the value and the other keys and values the same?
bookMap = new Map()
bookMap = Map(3) {
'Horror': [
{ id: 9798721052927, title: 'Dracula', author: 'Brahm Stoker' },
{ id: 9798721052928, title: 'Dracula 2', author: 'Brahm Stoker' }
],
'Romance': [
{ id: 9798721052933, title: 'Love Story', author: 'Brahm Stoker' }
],
'Comedy': [ { id: 9797221052931, title: 'Ha Story', author: 'Brahm Stoker' } ]
}
const renameKey = (oldKey, newKey, { [oldKey]: old, ...others }) => ({
[newKey]: old,
...others
})
nbm = renameKey('Horror', 'Cusisine', { ['Horror']: bookMap.get('Horror'), ...bookMap })
What do I put as ...others to get the ouput as bookMap with all 3 keys, not just the newly changed one?
·
Juan Pablo Isaza
1 answers
Answer question0
Your function is designed for an object, not for a Map. A map destructured into an array of arrays. If you want to achieve the same functionality you can use a method like below :
const renameKey = (oldKey: string, newKey: string, map: Map<string, any>) => {
const old = map.get(oldKey);
const rest = [...map].filter(r => r[0] !== oldKey);
return new Map(
[[newKey, old],
...rest]);
}
·
Juan Pablo Isaza
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