var d = new Date(“January 14, 2012”); console.log(d.toLocaleDateString()); d.setMonth(d.getMonth() – 3); console.log(d.toLocaleDateString()); Here is what the above code is Doing: 1. Create a new Date object with the date January 14, 2012. 2. Print the date to the console. 3. Subtract three months from the date. 4. Print the date to the console.

function isValidEmail(email) { const re = /^(([^()\[\]\\.,;:\s@”]+(\.[^()\[\]\\.,;:\s@”]+)*)|(“.+”))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/; return re.test(String(email).toLowerCase()); } Here is what the above code is Doing: 1. We’re importing the required modules. 2. We’re defining a function called isValidEmail. 3. We’re using a regular expression to check if the email is valid. 4. We’re returning true or false based on the result of…

$(this).closest(‘tr’).remove(); Here is what the above code is Doing: 1. When the user clicks on the “Delete” button, the code will find the closest “tr” element (which is the row that contains the button) and remove it.

// Compare two dates (times) in JS const ONE_DAY = 86400000; const today = new Date(); const yesterday = new Date(Number(today) – ONE_DAY); console.log(yesterday < today); // true Here is what the above code is Doing: 1. We create a new Date object called today. 2. We create a new Date object called yesterday. 3....

//add event.preventDefault() example, function clickHandler(event){ alert(“Hey you clicked the submit button”); event.preventDefault(); } //this will prevent the page from getting automatically refreshed after //the submit button is hit. Here is what the above code is Doing: 1. We are selecting the submit button using the id attribute. 2. We are adding an event listener to…

function dataURLtoFile(dataurl, filename) { var arr = dataurl.split(‘,’), mime = arr[0].match(/:(.*?);/)[1], bstr = atob(arr[1]), n = bstr.length, u8arr = new Uint8Array(n); while(n–){ u8arr[n] = bstr.charCodeAt(n); } return new File([u8arr], filename, {type:mime}); } //Usage example: var file = dataURLtoFile(‘data:text/plain;base64,aGVsbG8gd29ybGQ=’,’hello.txt’); console.log(file); Here is what the above code is Doing: 1. The dataURLtoFile function takes a dataURL and…