I have some objects inside js Map object. How do we remove object with particular key and value?
let newMap = new Map()
newMap.set('1', {ep: '1', name: 'First test'})
newMap.set('2', {ep: '2', name: 'Second test'})
So, the above example holds two object inside newMap. How can I remove object with ep value '1', so that the newMap hash returns only one object i.e. {ep: '2', name: 'Second test'}.
You've stored it under the key '1'. So you call delete with that key:
newMap.delete('1');
If you don't know the key you've stored it under, a Map probably isn't the structure you wanted, but you can find it by looping through entries, which returns an array whose entries are arraysin [key, value] format:
for (const entry of newMap.entries()) { // for-of is ES2015+
if (entry[1].ep === '1') {
newMap.delete(entry[0]);
break;
}
}
...or with ES5:
newMap.entries().some(function(entry) {
if (entry[1].ep === '1') {
newMap.delete(entry[0]);
return true;
}
});
You'll have to iterate over the entries and find the object you want to remove, then delete the appropriate key:
let newMap = new Map();
newMap.set('1', {ep: '1', name: 'First test'});
newMap.set('2', {ep: '2', name: 'Second test'});
const entryToRemove = [...newMap.entries()].find(([, { ep }]) => ep === '1');
newMap.delete(entryToRemove[0]);
console.log(newMap); // look in browser console, not snippet console(Of course, if you can count on the map's key being the same as the ep, just do newMap.delete(epToDelete))
Your map looks like this:
Map { '1' => { ep: '1', name: 'First test' }, '2' => { ep: '2', name: 'Second test' } }
To remove ep:'1' and have onlye ep:'2' you can try this:
newMap.delete('1');
