JavaScript Programmatically modifying maps based on inner condition

You could iterate the map and if the wanted value is found, filter the array and assign the filtered array.

const map = new Map([['123', [['foo', 'bar']]], ['456', [['baz', 'qux'], ['quux', 'corge']]]]);

map.forEach((v, k, m) => {
    if (v.some(a => a[0] === 'quux')) {
        m.set(k, v.filter(a => a[0] !== 'quux'));
    }
});

console.log([...map]);

Answer:1

You can loop over the values of the Map, use findIndex on each value v to see if it includes an array whose first element is quux, and splice that array out if so:

const map = new Map().set('123', [ [ 'foo', 'bar' ] ]).set('456', [ [ 'baz', 'qux' ], [ 'quux', 'corge' ] ]);

console.log("before", [...map]);

for (const v of map.values()) {
  const index = v.findIndex((a) => a[0] === "quux");
  
  if (index > -1) {
    v.splice(index, 1);
  }
}

console.log("after", [...map]);

Answer:2

You could do the key dynamically with a for of loop like this:

BTW open your devtools to checkout the new map since map cannot be properly displayed in the code snippet.

const Map = new Map().set('123', [
  ['foo', 'bar']
]).set('456', [
  ['baz', 'qux'],
  ['quux', 'corge']
]);


for (let el of Map) {
  Map.set(el[0], (Map.get(el[0])).filter(array => array[0] !== 'quux'));
}


console.log(Map);

Answer:3

Iterate over key-value pair of the map, the value will have the outer array from which we can filter out the inner array having the value we are looking for. We can get the index of the inner array from the forEach function, using which we can use the splice function to remove the inner array from the outer array.

const map = new Map().set('123', [ [ 'foo', 'bar' ] ]).set('456', [ [ 'baz', 'qux' ], [ 'quux', 'corge' ] ]);
map.forEach((v, k)=>
{
     v.forEach((arr, idx)=> {
     if(arr.includes('quux')){
            v.splice(idx,1);
        }
    },)
});
console.log(map);

Answer:4

UI lag between my javascript and my ported elm

I have a navbar which needs to change colour on scroll. This functionality was originally built with js, however now it has a 'Login' button which is built in elm to perform other functionality. I ...

You have included the Google Maps JavaScript API multiple times on this page. This may cause unexpected errors. when called using $.getScript()

Prelog: I have implemented Google maps and Geolocation as a independent widgets, Now the user have the ability to add the widget as much as he wants in a page he is owns. I am using $.getScript(URl, ...

you have included the google maps

Hide rows in table A that appear in table B

I have Table (Employees) A: +----+---------+ | ID | NAME | +----+---------+ | 1 | ROBERT | | 2 | JAMES | | 3 | RICHARD | | 4 | KANYE | | 5 | DYLAN | | 6 | JOHN | | 7 | JEAN | | ...

hide rows table jquery
hide rows table html
hide rows table
hide rows table in word
hide table rows javascript
hide table rows css
hide table rows in confluence
hide table rows in word 2016
hide table rows excel
hide table rows using css
hide table rows using jquery
hide table rows using javascript
hide table rows with empty td element
hide table rows asp.net
hide table rows if empty
hide table rows filter
hide table rows with button
hidden table rows css
hide rows pivot table
hide rows in table access

How can I find a specific string within a path using regex? [duplicate]

I have the following path: /s/STRINGINEED/abcdef/ How should I structure my regex to match STRINGINEED as a result? /s/ is a fixed path, so I would like to get any string between /s/ and the ...

find specific string in excel
find specific string in python
find specific string in list python
find specific string in php
find specific string regex
find specific string in linux
find specific string in excel cell
find specific string matlab
find specific string in file python
find specific string in c#
find specific string in file linux
find specific string in array javascript
find specific string in sql
find specific string in text file powershell
find specific string in all files linux
find specific string in javascript
find specific string in stored procedure
find specific string in sql database
find specific string in r
find specific string in jquery