Tom's Two-up Two-down


Today Has an "a"

We can use the logical && and || operators to determine whether to invoke a function depending on an expression's truthy/falsy value. Here is a simple example:

  • The day of the week includes the letter "a", and I need to blog
  • Either I already blogged today (stop evaluating), or I need to blog

And this is how that looks in JavaScript:

const blog = () => {
console.log('I need to blog');

let todayHasAnA = (today) => {
today.includes('a') && blog();

// "I need to blog"

let blogToday = (blogged) => {
blogged || blog();

// "I need to blog";