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