this is a small utility package for testing creating npm packages
These are the current functions in the library
This function just appends two strings
expect(append('thing')('some')).toEqual('something');This function can be used to map over complex data to filter out the results
const items = Box(data)
.map((x) => x.filter((i) => i.dept === 1))
.map((x) => x.filter((i) => i.vendor === 1))
.map((x) => x.filter((i) => i.category === 1))
.map((x) => x.filter((i) => i.price > 2.0))
.map((x) => x.filter((i) => i.price < 3.0))
.fold((x) => x);This function is used to compose other functions in a chainable point free fashion.
const addOne = (x) => x.map((y) => y + 1);
const addTwo = (x) => x.map((y) => y + 2);
const result = compose(addOne, addTwo);
expect(result(arr)).toEqual([4, 5, 6, 7, 8, 9]);This function can be used like Partial Application. You can lazily load arguments and when the function has received all the necessary arguments, then it will run the function
const curriedSum = curry(sum);
expect(curriedSum(4)(5)).toEqual(9);
const curriedSum = curry(sum);
const fn1 = curriedSum(4);
const result = fn1(5);
expect(result).toEqual(9);This function gets a property from an object
const fn1 = prop('name');
const result = fn1(obj);
expect(result).toEqual('mike');This monad can be used when a null value could be expected from data received from a server
const maybeNumberOne = Maybe.just(5);
const maybeNumberTwo = Maybe.nothing();
expect(maybeNumberOne.isNothing()).toBeFalsy();
expect(maybeNumberTwo.isNothing()).toBeTruthy();This is a First-in First-out data structure.
const queue = new Queue<string>();
queue.enqueue('a');
queue.enqueue('b');
const result = queue.dequeue();
expect(result).toEqual('a');
expect(queue.size()).toEqual(1);This is First-in Last-out data structure.
const stack = new Stack<string>();
stack.push('a');
expect(stack.size()).toEqual(1);
expect(stack.peek()).toEqual('a');
stack.pop();
expect(stack.size()).toEqual(0);