filter/find, map, reduce, sort

fmrs is a collection of utility functions that filter/find, map, reduce, and sort JavaScript primitives and built-ins between each other.

For example:

• Mapping the boolean true to a string would be 'true'.
• Reducing the entries [['key', 'value']] to a record would be { key: 'value' }.
• Sorting the values 1 and 2 would be -1.

Filters and finders

• Record<number | string | symbol, unknown> (isRecord)
• array (isArray)
• boolean (isBoolean)
• defined (isDefined)
• number (isNumber)
• object (isObject)
• string (isString)
• undefined (isUndefined)

Mappers

| from | to | example | | --------- | -------- | ---------------------------------------- | | boolean | number | [false, true].map(mapBooleanToNumber) | | entries | Record | mapEntriesToRecord([['key', 'value']]) | | entry | key | mapEntryToKey(['key', 'value']) | | entry | value | mapEntryToValue(['key', 'value']) | | Map | entries | mapMapToEntries(new Map()) | | Map | Record | mapMapToRecord(new Map()) | | unknown | Error | arr.map(toError) | | unknown | index | arr.map(toIndex) | | unknown | string | arr.map(toString) |

Reducers

| from | to | example | | ------- | -------- | ---------------------------------------------------------- | | entries | Record | Object.entries(record).reduce(reduceEntriesToRecord, {}) |

Sorters

| items | example | | --------- | -------------------------------------- | | arrays | arrOfArrs.sort(sortArraysByIndex(0)) | | numbers | arr.sort(sortNumbers) | | strings | arr.sort(sortStrings) | | unknown | arr.sort(sort) |

Utilities

| function | example | | -------- | --------------------------------- | | is | ['a', 'b'].filter(is('a')) | | isNot | ['a', 'b'].filter(isNot('a')) | | not | ['a', 'b'].filter(not(is('a'))) |