Push into an Array in JavaScript

let myarray = [1,2,3,4,5]

// Add to the start of an array

Array.unshift(element);

myarray.unshift(100); // output 100,1,2,3,4,5

// Add to the end of an array

Array.push(element);

myarray.push(100); // output 1,2,3,4,5,100

// Add to a specified location

Array.splice(start_position, 0, new_element...);

myarray.splice(2, 0, 100,200); // output 1,2,100,200,3,4,5

// Add with concat method without mutating original array

let newArray = [].concat(element);

let newmyarray = myarray.concat(10,20);

Sort JSON Array with Value

Example:Sort JSON Array

mydata = [{ "id": 1, "first_name": "Jean", "last_name": "Esome", "age": 63}, { "id": 2, "first_name": "Rubi", "last_name": "Simonassi", "age": 18}, { "id": 3, "first_name": "Theo", "last_name": "Mully", "age": 34}, { "id": 4, "first_name": "Barbabra", "last_name": "Castagnasso", "age": 82}, { "id": 5, "first_name": "Mahmud", "last_name": "Boothebie", "age": 25}]; function sortResults(obj,prop, asc) { obj.sort(function(a, b) { if (asc) { return (a[prop] > b[prop]) ? 1 : ((a[prop] < b[prop]) ? -1 : 0); } else { return (b[prop] > a[prop]) ? 1 : ((b[prop] < a[prop]) ? -1 : 0); } }); } //Call Function sortResults(mydata,'first_name', false); // true = ascending / false = descending

Sort JSON object Array

Sort JSON object Array

var array = [{ "No": "12", "Name": "Sameer Patel", "Training": "SharePoint" }, { "No": "2", "Name": "Syam Shah", "Training": "ASP.NET" }, { "No": "11", "Name": "Sunil Shah", "Training": "JAVA" }, { "No": "8", "Name": "Arun Nair", "Training": "Sql Server" }, { "No": "6", "Name": "Anil Patel", "Training": "C#" }]; //Sorting Function function SortBy(prop) { return function(a, b) { if (a[prop] > b[prop]) { return 1; } else if (a[prop] < b[prop]) { return -1; } return 0; } } //array.sort(SortBy("KeyName")) array.sort(SortBy("No"))

Simple JaveScript Tricks with Array and Object

Combining Multiple Objects

Consider you have three different objects:
const obj1 = {'No': 1, 'firstname': 'Rakesh'};
const obj2 = {'lastname': 'Patel'};
const obj3 = {'Sex': 'Male','progLang':['.Net','MVC','SharePoint']};

combine all the above 3 object into another object:

const objCombined = {...obj1, ...obj2, ...obj3};

The '…' is the spread operator. You can read more about this in the MDN Web Docs

Check if an object is an array

const obj = {data: 1};
const arr = [1, 2, 3];

Array.isArray(obj);  // false
Array.isArray(arr);  // true

Rest parameter syntax

A function that accepts any number of arguments. There is a special syntax called the rest parameter syntax to create such a function.

Example 1:

function test(...values) {
    console.log(values);
}
test(1);
test(1, 2);
test(1, 2, 3);
test(1, 2, 3, 4);

output:
[1]
[1, 2]
[1, 2, 3]
[1, 2, 3, 4]

you can even pass object as a arguments

Example 2:

function sum(...values) {
    let sum = 0;
    for (let i = 0; i < values.length; i++) {
        sum += values[i];
    }
  
    return sum;
}

console.log(sum(1));
console.log(sum(1, 2));
console.log(sum(1, 2, 3));
console.log(sum(1, 2, 3, 4));

output:
1
3
6
10