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React filter and then swap array elements

By : user2175006
Date : October 16 2020, 08:10 PM
wish of those help You can use filter to filter out the array and then swap using the prototype
code :
Array.prototype.swap = function (swapFirst,swapSecond) {
var x = this.findIndex(a=> a === swapFirst);
var y = this.findIndex(a=> a === swapSecond);
var b = this[y];
this[y] = this[x];
this[x] = b;
return this;


var apiData = [0,1,2,3,4,5,6,7,8,9];
var filtered= apiData.filter(a=> a > 2).swap(7,8);

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How to swap array elements?

By : 曾维龙
Date : March 29 2020, 07:55 AM
hop of those help? Javascript passes everything by value, you can't pass things by reference, and there are no pointers. Thus, if you want to swap two elements, you'll need to give it the array and the indices:
code :
function swap(var arr:GameObject[], var i, var j) {
    var temp:GameObject = arr[i];
    arr[i] = arr[j];
    arr[j] = temp;
swap(cps, 0, 1);

How to swap elements of array?

By : user3120067
Date : March 29 2020, 07:55 AM
help you fix your problem There's a swap method on slices: data.swap(i, j).
The original code doesn't work because the language requires that &muts do not alias, that is, if a piece of data is accessible via an &mut, then there must be no other way to use that data. In general, for successive indexes data[i], data[j], the compiler cannot guarantee that i and j are different. If they are the same then the indexing is referring to the same memory and so &mut data[i] and &mut data[j] would be two pointers to the same data: illegal!
code :
use std::cmp::Ordering;
use std::mem;

fn swap<T>(x: &mut [T], i: usize, j: usize) {
    let (lo, hi) = match i.cmp(&j) {
        // no swapping necessary
        Ordering::Equal => return,

        // get the smallest and largest of the two indices
        Ordering::Less => (i, j),
        Ordering::Greater => (j, i),

    let (init, tail) = x.split_at_mut(hi);
    mem::swap(&mut init[lo], &mut tail[0]);

Java-How to swap 2 array elements and use toString to output each swap of shell-sort?

By : Muthu Jk
Date : March 29 2020, 07:55 AM
wish helps you To print your array, use System.out.println(Arrays.toString(array))
To swap array element,

How can I swap two elements in one array?

By : user3116135
Date : March 29 2020, 07:55 AM
I hope this helps you . I have an array like :
code :

# Reversing a list using slice notation
print (a[::-1]) # [7, 2]

# The reversed() method
print (list(reversed(a))) # [7, 2]
# Swap function
def swapPositions(list, pos1, pos2):
    list[pos1], list[pos2] = list[pos2], list[pos1]
    return list

pos1, pos2 = 0, 1

print(swapPositions(a, pos1 - 1, pos2 - 1))

Get length of all elements in array to create a filter in javascript/react

By : tommytracey
Date : March 29 2020, 07:55 AM
Hope this helps I have a list of jokes in an array and I want to filter out all the jokes with less than 40 characters. I can get the length of individual jokes in the array for example the 4th one in the array: , Use the below code to filter jokes with length less than 40.
code :
const filteredJokes = jokeComponents.filter((joke) => joke.props.punchLine.length < 40);
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