Native operations with JS

native.js

var node = document.createElement("LI");                 // Create a <li> node
var textnode = document.createTextNode("Water");         // Create a text node
node.appendChild(textnode);                              // Append the text to <li>
document.getElementById("myList").appendChild(node);     // Append <li> to <ul> with id="myList"
var teste = document.querySelector("#teste");

var element = document.getElementById("element-id");
element.outerHTML = "";
delete element;

var str = "How are you doing today?";
var res = str.split(" ");
var str = "Visit Microsoft!";
var res = str.replace("Microsoft", "W3Schools");

var fruits = ["Banana", "Orange","Apple", "Mango"];
var join = fruits.join(" * "); //Banana * Orange * Apple * Mango
fruits.pop();              // Removes the last element ("Mango") from fruits
fruits.push("Kiwi");       //  Adds a new element ("Kiwi") to fruits
fruits.shift();            // Removes the first element "Banana" from fruits
fruits.unshift("Lemon");    // Adds a new element "Lemon" to fruits

fruits.sort(); // Sorts the elements of fruits
fruits.reverse();         // Reverses the order of the elements

var myGirls = ["Cecilie", "Lone"];
var myBoys = ["Emil", "Tobias","Linus"];
var myChildren = myGirls.concat(myBoys);     // Concatenates (joins) myGirls and myBoys

document.getElementById("demo").innerHTML = fruits.toString();

var ages = [32, 33, 12, 40];
var maior = ages.filter(function (age) {
    return age >= 18;
});

var d = new Date();
var d = new Date(milliseconds);
var d = new Date(dateString);
var d = new Date(year, month, day, hours, minutes, seconds, milliseconds);