remeda/dist/countBy.cjs.map

A utility library for JavaScript and Typescript.

{"version":3,"file":"countBy.cjs","names":["purry"],"sources":["../src/countBy.ts"],"sourcesContent":["import type { BoundedPartial } from \"./internal/types/BoundedPartial\";\nimport { purry } from \"./purry\";\n\n/**\n * Categorize and count elements in an array using a defined callback function.\n * The callback function is applied to each element in the array to determine\n * its category and then counts how many elements fall into each category.\n *\n * @param data - The array.\n * @param categorizationFn - The categorization function.\n * @signature\n *   R.countBy(data, categorizationFn)\n * @example\n *    R.countBy(\n *      [\"a\", \"b\", \"c\", \"B\", \"A\", \"a\"],\n *      R.toLowerCase()\n *    ); //=> { a: 3, b: 2, c: 1 }\n * @dataFirst\n * @category Array\n */\nexport function countBy<T, K extends PropertyKey>(\n  data: ReadonlyArray<T>,\n  categorizationFn: (\n    value: T,\n    index: number,\n    data: ReadonlyArray<T>,\n  ) => K | undefined,\n): BoundedPartial<Record<K, number>>;\n\n/**\n * Categorize and count elements in an array using a defined callback function.\n * The callback function is applied to each element in the array to determine\n * its category and then counts how many elements fall into each category.\n *\n * @param categorizationFn - The categorization function.\n * @signature\n *   R.countBy(categorizationFn)(data)\n * @example\n *    R.pipe(\n *      [\"a\", \"b\", \"c\", \"B\", \"A\", \"a\"],\n *      R.countBy(R.toLowerCase()),\n *    ); //=> { a: 3, b: 2, c: 1 }\n * @dataLast\n * @category Array\n */\nexport function countBy<T, K extends PropertyKey>(\n  categorizationFn: (\n    value: T,\n    index: number,\n    data: ReadonlyArray<T>,\n  ) => K | undefined,\n): (data: ReadonlyArray<T>) => BoundedPartial<Record<K, number>>;\n\nexport function countBy(...args: ReadonlyArray<unknown>): unknown {\n  return purry(countByImplementation, args);\n}\n\nconst countByImplementation = <T>(\n  data: ReadonlyArray<T>,\n  categorizationFn: (\n    value: T,\n    index: number,\n    data: ReadonlyArray<T>,\n  ) => PropertyKey | undefined,\n): BoundedPartial<Record<PropertyKey, number>> => {\n  const out = new Map<PropertyKey, number>();\n\n  for (const [index, item] of data.entries()) {\n    const category = categorizationFn(item, index, data);\n    if (category !== undefined) {\n      const count = out.get(category);\n      if (count === undefined) {\n        out.set(category, 1);\n      } else {\n        out.set(category, count + 1);\n      }\n    }\n  }\n\n  return Object.fromEntries(out);\n};\n"],"mappings":"wCAqDA,SAAgB,EAAQ,GAAG,EAAuC,CAChE,OAAOA,EAAAA,EAAM,EAAuB,EAAK,CAG3C,MAAM,GACJ,EACA,IAKgD,CAChD,IAAM,EAAM,IAAI,IAEhB,IAAK,GAAM,CAAC,EAAO,KAAS,EAAK,SAAS,CAAE,CAC1C,IAAM,EAAW,EAAiB,EAAM,EAAO,EAAK,CACpD,GAAI,IAAa,IAAA,GAAW,CAC1B,IAAM,EAAQ,EAAI,IAAI,EAAS,CAC3B,IAAU,IAAA,GACZ,EAAI,IAAI,EAAU,EAAE,CAEpB,EAAI,IAAI,EAAU,EAAQ,EAAE,EAKlC,OAAO,OAAO,YAAY,EAAI"}