Tiny, but fully loaded test-runner.
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module.exports = {
/* Flattens an array of arrays to an array */
flatten : arrData => [].concat.apply([], arrData),
/* Maps a function over an array */
map : fn => x => x.map(fn),
/* Returns identity */
identity : x => x,
/* Wraps a value in an object with given key */
wrapWith : x => y => ({ [x] : y }),
/* Unwraps a value from an object with given key */
unwrapFrom : x => y => y[x],
/* Resolves an array of Promises */
promiseAll : x => Promise.all(x),
/* Pipe a value or promise through any number of unary functions */
pipe: (...fns) =>
arg => fns.reduce((acc, fn) =>
typeof acc.then === 'function'
? acc.then(fn)
: fn(acc), arg),
/* Pass partial arguments and return a function that accepts the rest */
partial: (fn, ...args) => (...rest) => fn(...args, ...rest),
/* Item is in collection */
isIn : (collection, item) => collection.indexOf(item) !== -1,
/* Collection contains given path */
containsPath : (collection, path) => collection.some(
x => path.match(new RegExp(`/${x}/?$`))
),
/* Lift promises into a function */
liftPromise : (fn, thing) =>
typeof thing.then === 'function'
? thing.then(fn)
: fn(thing),
/* Stringifies object or coerces to string */
stringify : obj =>
typeof obj === 'object'
? (obj.stack || JSON.stringify(obj))
: obj,
/* Short circuits with given value on pred. Else calls function */
short : (pred, shorter) =>
fn => value => pred(value) ? shorter(value) : fn(value),
};