57 lines
1.4 KiB
TypeScript
57 lines
1.4 KiB
TypeScript
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function compose(...fns) {
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return (arg) => fns.reduce((acc, fn) => fn(acc), arg)
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}
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function partialRight(fn, ...args) {
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return (...leftArgs) => fn(...leftArgs, ...args)
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}
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function addInArrayAtPosition(array, element, position) {
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const arrayCopy = [...array]
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arrayCopy.splice(position, 0, element)
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return arrayCopy
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}
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function removeFromArrayAtPosition(array, position) {
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return array.reduce((acc, value, idx) => (idx === position ? acc : [...acc, value]), [])
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}
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function changeElementOfPositionInArray(array, from, to) {
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const removeFromArrayAtPositionFrom = partialRight(removeFromArrayAtPosition, from)
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const addInArrayAtPositionTo = partialRight(addInArrayAtPosition, array[from], to)
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return compose(removeFromArrayAtPositionFrom, addInArrayAtPositionTo)(array)
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}
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function identity(value) {
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return value
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}
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function when(value, predicate = identity) {
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return function callback(callback) {
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if (predicate(value)) return callback(value)
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}
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}
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function replaceElementOfArray(array) {
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return function (options) {
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return array.map((element) => (options.when(element) ? options.for(element) : element))
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}
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}
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function pickPropOut(object, prop) {
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return Object.keys(object).reduce((obj, key) => {
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return key === prop ? obj : { ...obj, [key]: object[key] }
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}, {})
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}
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export {
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addInArrayAtPosition,
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removeFromArrayAtPosition,
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changeElementOfPositionInArray,
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when,
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replaceElementOfArray,
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partialRight,
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pickPropOut,
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}
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