var address = "foo";
var city;
var state = "bar";
var zip;
text = [address, city, state, zip].filter(Boolean).join(", ");
console.log(text)
Here is what the above code is Doing:
1. We create a variable called text and set it equal to an array of strings.
2. We use the filter() method to remove any falsy values from the array.
3. We use the join() method to join the array elements into a string.
4. We log the result to the console.
const fs = require(‘fs’); fs.appendFileSync(‘message.txt’, ‘data to append’); Here is what the above code is Doing: 1. We’re requiring the fs module. 2. We’re appending the string ‘data to append’ to the file message.txt.
function test() { console.log(‘Executed function “test”.’); } window[‘test’](); Here is what the above code is Doing: 1. We’re creating a function called test. 2. We’re assigning the function to a property of the window object. 3. We’re calling the function. The window object is the global object in the browser. It’s the object that all…
// @florinrelea const selectElementId = ‘example’ const htmlOptionsCollections = document.getElementById(selectElementId).options const options = Array.from(htmlOptionsCollections).map(el=> el.textContent) console.log(options) Here is what the above code is Doing: 1. We get the HTMLCollection of options from the select element 2. We convert the HTMLCollection to an array 3. We map the array to get the textContent of each option
Here is what the above code is Doing: 1. We’re importing the Link component from react-router-dom. 2. We’re using the Link component to create a link to the root route. 3. We’re passing the link a style prop that has a value of {textDecoration: “none”}. 4. We’re passing the Link component a child of “Home”.
function compare(num1, num2, num3) { if (num3 > num2 && num1 > num3) { return num1 + ‘ is the biggest number’; } else if (num2 > num1 && num2 > num3) { return num2 + ‘ is the biggest number’; } else { return num3 + ‘ is the biggest number’; } } var…
// JavaScript uses the 64-bit IEEE-754 floating point standard for storing numbers const num = 314.15926535; // toFixed(n) will convert a float to a string with n digits after the decimal point num.toFixed() // “314” (same as num.toFixed(0)) num.toFixed(2) // “314.16” num.toFixed(6) // “314.159265” // toPrecision(n) will convert a float to a string with n…