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Remove element from nested array [closed]

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I have this data:
const pages = [
[
{id: 1},
{id:2}
],
[
{id: 3},
{id:4}
],
];
What would the best and more efficient way to remove an element from this structure having 2 indexes as params?
e.g. index1 = 1 and index2 = 0 will remove pages[1][0] and pages will be:
const pages = [
[
{id: 1},
{id:2}
],
[
{id:4}
],
];

You can use array.splice to remove an item from an array:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
The splice() method changes the contents of an array by removing or
replacing existing elements and/or adding new elements in place. To
access part of an array without modifying it, see slice().
This is the demo with a function implementing what did you request for:
const pages = [
[
{id: 1},
{id:2}
],
[
{id: 3},
{id:4}
],
];
removeItem(1,0);
console.log(pages);
function removeItem(index1, index2){
pages[index1].splice(index2, 1);
}

Try this :
const idx1 = 1;
const idx2 = 0;
pages[idx1].splice(idx2, 1);

How to filter/search for multiple keys in an object? [closed]

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I have a dynamic array whose length keeps changing
Ex: let array = [1,2]
I have an array of objects, whose length also keeps changing:
let obj = [
{id: 1, value: abc, location: xyz},
{id: 2, value: pqr, location: xyz},
{id: 3, value: rqp, location: xyz}
]
I want to return a final array of objects which has the id of "array" in "obj" i.e
[
{id: 1, value: abc, location: xyz},
{id: 2, value: pqr, location: xyz}
]
Does filter work in this case?

You can use Array.prototype.filter and Array.prototype.includes for this.
obj.filter((item) => array.includes(item.id))

How do I group muiltiple record in array to object in Javascript? [duplicate]

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Group javascript array items on value
Assuming you have a json object like:
[
{
prNumber: 20000401,
text: 'foo'
},
{
prNumber: 20000402,
text: 'bar'
},
{
prNumber: 20000401,
text: 'foobar'
},
]
Is it possible to perform a "join" on prNumber?
For example, maybe the desired output would be something like:
[
{
prNumber: 20000401,
text: [
'foo',
'foobar'
]
},
{
prNumber: 20000402,
text: [
'bar'
]
}
]
I have no code samples worth anything, so I will not post them here.
This would preferrably use vanilla javascript, but will accept a jQuery answer.

You should iterate the initial array and create new objects keyed off the prNumber. Here's how to do it using reduce (assuming you've assigned the array to a variable named orig):
var result = orig.reduce(function(prev, curr, index, arr) {
var num = curr["prNumber"];
if (!prev[num]) {
prev[num] = [];
}
prev[num].push(curr["text"]);
return prev;
}, {});
You can easily convert this into the example structure outlined in your question.

Get array of objects from array of objects with specific properties using rxjs angular [closed]

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I have database which is array of objects. It look like this:
export const BIKES: Bike[] = [
{
id: 1,
imgUrl:
'https://cyclingmagazine.ca/wp-content/uploads/2018/10/Krypton_A18_2016_red_ultegra_16_1.jpg',
price: 28000,
discount: 71,
main: true,
shop: 'Canada Bike',
name: 'Argon 18',`
},
{
id: 2,
imgUrl:
'https://cyclingmagazine.ca/wp-content/uploads/2018/03/etap.shadowpsd_2048x.png',
price: 7900,
discount: 41,
main: false,
shop: 'Amazon',
name: 'Aquila Cycles',
}
I want to subscribe to array of objects which will consist of 2 properties 'name' and 'shop' and theirs values.

It can be implemented using Array.map
const result = BIKES.map(({name, shop}) => ({ name, shop }));
console.log(result);
or
const result = BIKES.map((item) => {
return {
name: item.name,
shop: item.shop
};
});
console.log(result);

JavaScript: Merge multiple Arrays object in to single Array of objects [closed]

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I am receiving the following data in the variable
let data = [
[{option: “foo0", value: “bar0”}],
[{option: “foo1", value: “bar1”}],
[{option: “foo2", value: “bar2”}],
[{option: “foo3", value: “bar3”}],
]
and I need to change the response to
[
{option: “foo0", value: “bar0”},
{option: “foo1", value: “bar1”},
{option: “foo2", value: “bar2”},
{option: “foo3", value: “bar3”},
]
how can i do it in JS

Use Array.flat():
const data = [[{"option":"foo0","value":"bar0"}],[{"option":"foo1","value":"bar1"}],[{"option":"foo2","value":"bar2"}],[{"option":"foo3","value":"bar3"}]]
const result = data.flat()
console.log(result)
If Array.flat() is not supported, you can flatten the array by spreading into concat:
const data = [[{"option":"foo0","value":"bar0"}],[{"option":"foo1","value":"bar1"}],[{"option":"foo2","value":"bar2"}],[{"option":"foo3","value":"bar3"}]]
const result = [].concat(...data)
console.log(result)

try this:
let data = [
[{
option: "foo0",
value: "bar0"
}],
[{
option: "foo1",
value: "bar1"
}],
[{
option: "foo2",
value: "bar2"
}],
[{
option: "foo3",
value: "bar3"
}],
];
let result = data.map(v => v[0]);
console.log(result);