JSFiddle - React, Tailwind, and code Playground
JavaScript
let ii = 1;
let inc = function() { ii++; }
console.log('Starting: ' + ii);
let input = prompt('Input something evil (suggestion: inc() or ii++)');
console.log(`You input: ${input}`);
console.log('After template literal: ' + ii);
eval(input);
console.log('After eval: ' + ii);