var arr = ["Zero", "One", "Two"];
document.write(arr.join(", "));
Here is what the above code is Doing:
1. We create an array called arr.
2. We use the join() method to join the elements of the array into a string.
3. We pass the separator “, ” as an argument to the join() method.
4. We print the string to the document.
document.addEventListener(“deviceready”, onDeviceReady, false); function onDeviceReady(){ document.addEventListener(“backbutton”, function(e){ if($.mobile.activePage.is(‘#homepage’)){ e.preventDefault(); navigator.app.exitApp(); } else { navigator.app.backHistory(); } }, false); } Here is what the above code is Doing: 1. When the device is ready, we add an event listener for the back button. 2. When the back button is pressed, we check if the current page is…
fs.readdir(‘./’, (err, files) => { files.forEach(file => { // console.log(file); })}); Here is what the above code is Doing: 1. We’re using the fs module to read the contents of the current directory. 2. We’re using the readdir method to read the contents of the directory. 3. We’re using a callback function to log the…
var alphabet = “ABCDEFGHIJKLMNOPQRSTUVWXYZ”; alphabet = alphabet.replace(/H.*S/, ‘HS’) Here is what the above code is Doing: 1. It’s creating a string called alphabet that contains all the letters of the alphabet. 2. It’s replacing the letters H through S with the letters HS. 3. It’s printing the new string.
function waitForElement(){ if(typeof someVariable !== “undefined”){ //variable exists, do what you want } else{ setTimeout(waitForElement, 250); } } Here is what the above code is Doing: 1. It checks if the variable exists. 2. If it does, it does what you want. 3. If it doesn’t, it waits 250 milliseconds and then tries again.
for(var i=1; i
//HTML //Javascript var canvas = document.getElementById(“canv”); canvas.width = canvas.height = 100; var ctx = canvas.getContext(“2d”); ctx.fillStyle = “red”; ctx.fillRect(10, 10, 80, 80); Here is what the above code is Doing: 1. We get the canvas element by its id. 2. We set the width and height of the canvas to 100 pixels. 3. We get…