jQuery move second last element of array to first. How to achieve?

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var unit_value = [1, 12, 100];
unit_value.push(unit_value.shift());
console.log(unit_value);

You can Try this:

unit_value.unshift(unit_value.splice(unit_value.length-2,1)[0]);

splice removes element at 2nd last position and returns array of removed elements(in this case only one element).

unshift is used to insert the same element we removed at beginning of the array.

Fastest way to move first element to the end of an Array, targeting and how many iterations of these sort of shifts do you need to do per second at most? Now what are the ways to add to the last index? If you are just using the first index, it will be fastest just to make your code read an Since the return value of the splice method is an array, you have to say .eq() lets you specify the index, but if you just want the first you can use .first(), or if you just want the last you can use (surprise!) .last(). "I get an array of elements." No you don't, you get a jQuery object which is an array-like object, not an actual array.

var unit_value = [1, 12, 13, 100, 15];
var seconLastEle = unit_value[unit_value.length-2];
unit_value.splice(unit_value.lastIndexOf(seconLastEle), 1);
unit_value.unshift(seconLastEle);
console.log(unit_value);

.slice(), An integer indicating the 0-based position at which the elements begin to be The jQuery .slice() method is patterned after the JavaScript .slice() method for arrays. One of then slices the selection to include only the first and second element. How to move first child to the end? It creates a jQuery plugin so that you can animate the items on any element. I didn't set it up to loop, as you said you

You don't need jQuery to achieve the solution, it's plain Javascript.

var unit_value = [1, 12, 100];
var removedUnit = unit_value.splice(unit_value.length - 2, 1)
unit_value.splice(0, 0, removedUnit)

:nth-last-child() Selector, Description: Selects all elements that are the nth-child of their parent, counting from the last element to the first. version added: 1.9jQuery(  Removing, Replacing and Moving Elements in jQuery 8 June 2010 / 5 Comments In Adding Elements to the Page in jQuery , you explored a number of ways to add new HTML elements — such as paragraphs and images — to a page.

You can use this function:

function array_move(arr, old_index, new_index) {
  if (new_index >= arr.length) {
    var k = new_index - arr.length + 1;
    while (k--) {
      arr.push(undefined);
    }
  }
  arr.splice(new_index, 0, arr.splice(old_index, 1)[0]);
  return arr; // for testing
};

demo

var unit_value = [1, 12, 100, 251];

function array_move(arr, old_index, new_index) {
  if (new_index >= arr.length) {
    var k = new_index - arr.length + 1;
    while (k--) {
      arr.push(undefined);
    }
  }
  arr.splice(new_index, 0, arr.splice(old_index, 1)[0]);
  return arr; // for testing
};

console.log(array_move(unit_value, (unit_value.length - 2), 0))

jQuery.merge(), It alters the length and numeric index properties of the first object to include items from the second. If you need the original first array, make a copy of it before  Because :last is a jQuery extension and not part of the CSS specification, queries using :last cannot take advantage of the performance boost provided by the native DOM querySelectorAll() method. To achieve the best performance when using :last to select elements, first select the elements using a pure CSS selector, then use .filter(":last").

As per my understanding, you are trying to move the 2nd last element of the array to the first place while making sure that the rest of the array remains the same.

Use Spread Syntax

var unit_value = [1, 12, 100];

unit_value = [...unit_value.splice(unit_value.length - 2, 1), ...unit_value];
console.log(unit_value);

JavaScript Array pop() Method, The pop() method removes the last element of an array, and returns that element. Note: This method changes the length of an array. Tip: To remove the first  Given a jQuery object that represents a set of DOM elements, the .last() method constructs a new jQuery object from the last element in that set.. Consider a page with a simple list on it:

Get the first and last item in an array using JavaScript, Program to Insert new item in array on any position in PHP · How to compare two JavaScript array objects using jQuery/JavaScript ? How to convert Integer array to  link Moving, Copying, and Removing Elements. While there are a variety of ways to move elements around the DOM, there are generally two approaches: Place the selected element(s) relative to another element. Place an element relative to the selected element(s). For example, jQuery provides .insertAfter() and .after().

Array.prototype.shift(), The shift() method removes the first element from an array and returns Objects which do not contain a length property reflecting the last in a  Assuming array is a jQuery array a negative index can be used to get an element from the back of the array. So index -1 == length -1 which is the last element of the array.

:nth-last-child, The :nth-last-child selector allows you select one or more elements <ul> <li>​First Item</li> <li>Second Item</li> <li>Third Item</li> elements—similar to navigating items in an array in JavaScript. perspective-origin · place-items · pointer-events · position Frontend Masters is the best place to get it. Books. Learning jQuery Fourth Edition Karl Swedberg and Jonathan Chaffer jQuery in Action Bear Bibeault, Yehuda Katz, and Aurelio De Rosa jQuery Succinctly Cody Lindley

Comments
  • what are you tying to achieve ? reverse ?
  • are you sure you want JQuery for this ?
  • @GeorgeBailey Index of value 100 is 1. But now I want to move it to first.
  • @Shubanker Fine in JS. If you can.
  • ... stand for what? BTW Working properly.
  • OK I read developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… got it. Thanks for help.
  • @shahrushabh - Welcome :)