Get the last elements in a JSON array in Javascript

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I have a JSON array like this:

[
    {
        "id": "1",
        "name": "A"
    },
    {
        "id": "2",
        "name": "B"
    },
    {
        "id": "3",
        "name": "C"
    },
    {
        "id": "4",
        "name": "D"
    },
    ....
    ....
    {
        "id": "n",
        "name": "X"
    }
]

I'm looking for a slice() based function that gives the last 20 item of this JSON array


function getLast(array,x){return array.slice(array.length-x)}

Just use the slice function starting with the array length minus the number of elements you want to extract.

How can I access last object in JSON array - JavaScript, How can I access last object in JSON array · JavaScript and would like to match the last element that I have added when I called $('form'). I return this and parse the result I get back all my items in local storage but I would  See the Pen JavaScript - Get the last element of an array- array-ex-4 by w3resource (@w3resource) on CodePen. Improve this sample solution and post your code through Disqus Previous: Write a JavaScript function to get the first element of an array. Passing a parameter 'n' will return the first 'n' elements of the array.


A simple way with filters:

filteredList = list.filter((_, index) => {
    return index >= list.length - 20
})

Get the last element of an Array in JavaScript, Tip 7 in this Useful JavaScript Hacks Article proposes the following method to get the last item in an array. syntax1.js. 1. 2. var array = [  Get the last few elements in the array. You can use the same technique to slice the array starting from the end of it. Pretty cool.


If you just need the last X items in an array I'm not sure you need filter, you can use .slice eg [1,2,3,4,5,6,7,8,9,10].slice(-5) will return [6,7,8,9,10]

JavaScript array: Get the last element of an array, JavaScript exercises, practice and solution: Write a JavaScript function to get the last element of an array. Passing a parameter 'n' will return the  Arrays in JSON are almost the same as arrays in JavaScript. In JSON, array values must be of type string, number, object, array, boolean or null. In JavaScript, array values can be all of the above, plus any other valid JavaScript expression, including functions, dates, and undefined.


One option is to use splice or slice:

// Initialize array
let arr = new Array(50).fill().map((v,i)=>i)

// Pick off last 20 elements
console.log('Last:' + arr.slice(-20))

Get the first and last item in an array using JavaScript, Javascript array is a variable which holds multiple values at a time. The first and last elements are accessed using an index and the first value is accessed using  Learn how to get the last element from the array in javascript. There are multiple ways through which we can get the last element from the array in javascript. Using pop() We can use the pop() of array which removes and returns the last element of the array.


How to get the last item of JavaScript object ?, Given a JavaScript object and the task is to get the last element of the JavaScript Use Object.keys() method to get the all keys of the object. innerHTML = JSON.stringify(Obj); How to insert an item into array at specific index in JavaScript? Using slice() method The slice() method returns the selected elements in an array, as a new array object. If we pass -1 as an argument to the slice method we can get the last element in an array.


JSON Arrays, In JavaScript, array values can be all of the above, plus any other valid JavaScript expression, including functions, dates, and undefined. Arrays in JSON Objects. Get the first and last item in an array using JavaScript Javascript array is a variable which holds multiple values at a time. The first and last elements are accessed using an index and the first value is accessed using index 0 and the last element can be accessed through length property which has one more value than the highest array index.


JavaScript Array slice() Method, The slice() method returns the selected elements in an array, as a new array object. The slice() method selects the elements starting at the given start argument,  Arrays are a special type of objects. The typeof operator in JavaScript returns "object" for arrays. But, JavaScript arrays are best described as arrays. Arrays use numbers to access its "elements". In this example, person [0] returns John: var person = ["John", "Doe", 46]; Try it Yourself » Objects use names to access its "members". In this