var numberarr2 = numberarr.map( function(value) {
return value - 1;
} );
Here is what the above code is Doing:
1. We create an array of numbers.
2. We create a new array by mapping the first array.
3. We subtract 1 from each value in the first array and return it.
4. We store the new array in a variable.
JavaScript is the answer Here is what the above code is Doing: 1. We’re creating a variable called “answer” and assigning it the value of 42. 2. We’re creating a variable called “question” and assigning it the value of “The Ultimate Question of Life, the Universe, and Everything”. 3. We’re creating a variable called “javascript”…
function getRandomColor() { var letters = ‘BCDEF’.split(”); var color = ‘#’; for (var i = 0; i < 6; i++ ) { color += letters[Math.floor(Math.random() * letters.length)]; } return color; } Here is what the above code is Doing: 1. We are creating a function called getRandomColor() 2. We are creating a variable called letters...
var url = new URL(‘http://demourl.com/path?id=100’); var search_params = url.searchParams; // add “topic” parameter search_params.set(‘topic’, ‘main’); url.search = search_params.toString(); var new_url = url.toString(); // output : http://demourl.com/path?id=100&topic=main console.log(new_url); Here is what the above code is Doing: 1. Create a new URL object with the URL string. 2. Get the search parameters from the URL object. 3….
Yeah, you should use Addy Osmani’s grunt-uncss plugin to clean up unused CSS. I am not so sure whether you can use a tool for removing unused JS, since it depends on application logic, which part of JS code will be called. Here is what the above code is Doing: 1. It’s using the grunt-contrib-cssmin…
function reverseWords(str) { const allWords = str.split(” “) return allWords.map(item => item.split(“”).reverse().join(“”)).join(” “) } Here is what the above code is Doing: 1. We split the string into an array of words. 2. We map over the array of words and reverse each word. 3. We join the array of words back into a string.
var myArray = {id1: 100, id2: 200, “tag with spaces”: 300}; myArray.id3 = 400; myArray[“id4”] = 500; for (var key in myArray) { console.log(“key ” + key + ” has value ” + myArray[key]); } Here is what the above code is Doing: 1. We create an object called myArray. 2. We add three properties…