JS Ternary operator use cases

ternary.js

// conditional ? expression1 : expression2

// Variable assignments
const num = 20
const numDescription = num > 9 ? "10 or bigger" : "less than 10";
console.log("num is " + numDescription)

// Returning values
function getCost(isMember) {
  return isMember ? '$1.00' : '$2.00';
}
console.log("Cost for member " + getCost(true))

// Assigning object property values
const macBook = {
  model: "Macbook Air",
  processor: 2020 < new Date().getFullYear() ? "ARM": "x86"
}
console.log(macBook)

// Evaluation multiple expressions
function logger(logEntry) {
  logEntry.severity > 4 ? 
    (console.log("!!Danger!!"), console.log(logEntry.message)) :           console.log(logEntry.message)
}
const logEntry = {
  severity: 5,
  message: "Security breach"
}
logger(logEntry)