refactor: say bye to the weird groupBy friends (#13975)
* refactor(frontend): say bye to the weird groupBy friends * refactor(backend): say bye to the weird groupBy friends
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@ -65,44 +65,6 @@ export function maximum(xs: number[]): number {
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return Math.max(...xs);
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}
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/**
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* Splits an array based on the equivalence relation.
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* The concatenation of the result is equal to the argument.
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*/
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export function groupBy<T>(f: EndoRelation<T>, xs: T[]): T[][] {
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const groups = [] as T[][];
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for (const x of xs) {
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const lastGroup = groups.at(-1);
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if (lastGroup !== undefined && f(lastGroup[0], x)) {
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lastGroup.push(x);
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} else {
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groups.push([x]);
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}
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}
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return groups;
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}
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/**
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* Splits an array based on the equivalence relation induced by the function.
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* The concatenation of the result is equal to the argument.
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*/
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export function groupOn<T, S>(f: (x: T) => S, xs: T[]): T[][] {
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return groupBy((a, b) => f(a) === f(b), xs);
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}
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export function groupByX<T>(collections: T[], keySelector: (x: T) => string) {
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return collections.reduce((obj: Record<string, T[]>, item: T) => {
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const key = keySelector(item);
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if (!Object.prototype.hasOwnProperty.call(obj, key)) {
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obj[key] = [];
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}
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obj[key].push(item);
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return obj;
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}, {});
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}
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/**
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* Compare two arrays by lexicographical order
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*/
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@ -77,44 +77,6 @@ export function maximum(xs: number[]): number {
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return Math.max(...xs);
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}
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/**
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* Splits an array based on the equivalence relation.
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* The concatenation of the result is equal to the argument.
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*/
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export function groupBy<T>(f: EndoRelation<T>, xs: T[]): T[][] {
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const groups = [] as T[][];
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for (const x of xs) {
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const lastGroup = groups.at(-1);
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if (lastGroup !== undefined && f(lastGroup[0], x)) {
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lastGroup.push(x);
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} else {
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groups.push([x]);
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}
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}
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return groups;
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}
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/**
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* Splits an array based on the equivalence relation induced by the function.
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* The concatenation of the result is equal to the argument.
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*/
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export function groupOn<T, S>(f: (x: T) => S, xs: T[]): T[][] {
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return groupBy((a, b) => f(a) === f(b), xs);
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}
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export function groupByX<T>(collections: T[], keySelector: (x: T) => string) {
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return collections.reduce((obj: Record<string, T[]>, item: T) => {
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const key = keySelector(item);
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if (typeof obj[key] === 'undefined') {
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obj[key] = [];
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}
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obj[key].push(item);
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return obj;
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}, {});
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}
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/**
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* Compare two arrays by lexicographical order
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*/
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