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import { isArray, isObject } from './guards';
import { pipe } from './pipe';
import { purry } from './purry';
import { type } from './type';
export type SortValue = boolean | number | string;
export type ComplexSort = {
order?: 'asc' | 'desc';
value: SortValue;
compare?: (a: SortValue, b: SortValue) => number;
};
export type SortByProp = SortValue | ComplexSort | (SortValue | ComplexSort)[];
/**
* Sorts the list according to the supplied function in ascending order.
* Sorting is based on a native `sort` function. It's not guaranteed to be stable.
* @param array - the array to sort
* @param fn - the mapping function
* @signature
* P.sortBy(array, fn)
* @signature
* P.sortBy(fn)(array)
* @example
* P.sortBy(
* [{ a: 1 }, { a: 3 }, { a: 7 }, { a: 2 }],
* x => x.a
* )
* // => [{ a: 1 }, { a: 2 }, { a: 3 }, { a: 7 }]
*
* P.pipe(
* [{ a: 1 }, { a: 3 }, { a: 7 }, { a: 2 }],
* P.sortBy(x => x.a)
* ) // => [{ a: 1 }, { a: 2 }, { a: 3 }, { a: 7 }]
* @category Array, Pipe
*/
export function sortBy<T>(
array: readonly T[],
fn: (item: T) => SortByProp
): T[];
export function sortBy<T>(
fn: (item: T) => SortByProp
): (array: readonly T[]) => T[];
export function sortBy() {
return purry(_sortBy, arguments);
}
function _sortBy<T>(array: T[], fn: (item: T) => SortByProp): T[] {
const copied = clone(array);
const sortedArray = copied.sort((a, b) => {
const aa = fn(a);
const bb = fn(b);
type SortFunction = (a: SortValue, b: SortValue) => number;
/** Default comparison function */
const defaultCompare = (a: SortValue, b: SortValue) => {
return a < b ? -1 : a > b ? 1 : 0;
};
/** Easy way to swap order */
const order = (
order: 'asc' | 'desc',
sortFn: SortFunction
): SortFunction => {
switch (order) {
case 'asc':
return (a: SortValue, b: SortValue) => {
return sortFn(a, b);
};
case 'desc':
return (a: SortValue, b: SortValue) => {
return sortFn(b, a);
};
}
};
const sortComplex = (
aC: Exclude<SortByProp, Array<any>>,
bC: Exclude<SortByProp, Array<any>>
) => {
Iif (type(aC) !== type(bC)) {
throw new Error("Can't compare two different types");
}
if (isObject(aC) && isObject(bC)) {
const sortFn = order(aC.order || 'asc', bC.compare || defaultCompare);
const orderScore = sortFn(aC.value, bC.value);
return orderScore;
}
Iif (isObject(aC)) {
throw new Error('Impossible error'); // Code should never throw this error .Using this only as typescript guard
}
Iif (isObject(bC)) {
throw new Error('Impossible error'); // Code should never throw this error. Using this only as typescript guard
}
return order('asc', defaultCompare)(aC, bC);
};
if (isArray(aa) && isArray(bb)) {
Iif (aa.length !== bb.length) {
throw new Error(
'Critical sortBy error. Comparison properties should be static'
);
}
for (const sIndex of new Array(aa.length).fill(0).map((_, i) => i)) {
const aaV = aa[sIndex];
const bbV = bb[sIndex];
Iif (type(aaV) !== type(bbV)) {
throw new Error("Can't compare two different types");
}
const result = sortComplex(aaV, bbV);
if (result !== 0) {
return result;
}
}
}
Iif (type(aa) !== type(bb)) {
throw new Error("Can't compare two different types");
}
Iif (isObject(aa) && isObject(bb)) {
const sortFn = order(aa.order || 'asc', aa.compare || defaultCompare);
const orderScore = sortFn(aa.value, bb.value);
return orderScore;
}
Iif (isObject(aa)) {
throw new Error('Impossible error'); // Code should never throw this error .Using this only as typescript guard
}
Iif (isObject(bb)) {
throw new Error('Impossible error'); // Code should never throw this error. Using this only as typescript guard
}
return sortComplex(
aa as Exclude<SortByProp, Array<any>>,
bb as Exclude<SortByProp, Array<any>>
);
});
return sortedArray;
}
const l = [
{
a: 4,
x: 74,
},
];
pipe(
l,
sortBy(a => a.a)
);
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