concrete-matchers.js

const is = (target) => (value) => value === target;
const isOver = (target) => (value) => value > target;
const isUnder = (target) => (value) => value < target;
const isOrOver = (target) => (value) => value >= target;
const isOrUnder = (target) => (value) => value <= target;
const isMultipleOf = (target) => (value) => value % target === 0;

// thus, easy to make isEven, isOdd, isPrime, isEnabled, isConnected, isStared
// isFavorite, is404, isImageResponse e.t.c