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配列のすべての組み合わせについて、関数を実行する。
import flatten from 'lodash-es/flatten'
/**
* 配列のすべての組み合わせについて、関数を実行する。
* @param fun 関数
* @param cols 配列
* @return {Array}
* @example
* combination((x,y)=>x*y, [1,2,3], [4,5,6])
* => [4,5,6,8,10,12,12,15,18]
*
* combination((x,y)=>x*y, [1,2,3], [1,2,4], [1,2])
* => combination((x,y)=>x*y, [1,2,4,2,4,8,3,6,12], [1,2])
* => [1,2,2,4,4,8,2,4,4,8,8,16,3,6,6,12,12,24]
*/
export function combination (fun: Function, ...cols: any[][]) {
return cols.reduce((col1, col2) => {
return flatten(col1.map((c1: any) => col2.map((c2: any) => fun(c1, c2))))
})
}
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