BoundsOfValidation.js

const PRECISION = 0.2; // Often called a Delta

function isValid(time) { // Ensures 1 second has elapsed
  const expected = 1; 
  
  // We only assert this :  (expected - precision) <= time <= (expected + precision) 
  return (expected - PRECISION <= time) && (expected + PRECISION >= time);
}

console.log(isValid(1.105));
// => true

console.log(isValid(0.95));
// => true

console.log(isValid(2));
// => false