Add several more util functions and tests

- array.filled()

- tuple.filled()

- tuple.zip() (formarlly array.zipStrict())

- string.repeated()

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/common/hotbar-types.ts

@@ -20,7 +20,7 @@
  */
 
 import * as uuid from "uuid";
-import type { Tuple } from "./utils";
+import { tuple, Tuple } from "./utils";
 
 export interface HotbarItem {
   entity: {
@@ -46,7 +46,7 @@ export const defaultHotbarCells = 12; // Number is chosen to easy hit any item w
 export function getEmptyHotbar(name: string, id: string = uuid.v4()): Hotbar {
   return {
     id,
-    items: Array(defaultHotbarCells).fill(null) as Tuple<HotbarItem | null, typeof defaultHotbarCells>,
+    items: tuple.filled(defaultHotbarCells, null),
     name,
   };
 }

src/common/utils/__tests__/string.test.ts

@@ -0,0 +1,38 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+import { string } from "../../utils";
+
+describe("string tests", () => {
+  describe("repeated()", () => {
+    const table = [];
+    let acc = "";
+
+    for (let i = 0; i <= 20; i += 1) {
+      table.push([acc, i] as const);
+      acc += "l";
+    }
+
+    it.each(table)("should return %p string if times = %i", (output, times) => {
+      expect(string.repeated("l", times)).toBe(output);
+    });
+  });
+});

src/common/utils/__tests__/tuple.test.ts

@@ -0,0 +1,59 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+import { tuple } from "../../utils";
+
+describe("tuple tests", () => {
+  describe("zip()", () => {
+    it("should yield 0 times and return 1 tuple of empty arrays when given empty array", () => {
+      expect(tuple.zip([]).next()).toEqual({
+        done: true,
+        value: [[]],
+      });
+    });
+
+    it("should yield 1 times and return 2 tuple of empty arrays when given one element array tuples", () => {
+      const i = tuple.zip([1], [2]);
+
+      expect(i.next()).toEqual({
+        done: false,
+        value: [1, 2]
+      });
+      expect(i.next()).toEqual({
+        done: true,
+        value: [[], []],
+      });
+    });
+
+    it("should yield 1 times and return 2 tuple of partial arrays when given one element array tuples", () => {
+      const i = tuple.zip([1], [2, 3]);
+
+      expect(i.next()).toEqual({
+        done: false,
+        value: [1, 2]
+      });
+      expect(i.next()).toEqual({
+        done: true,
+        value: [[], [3]],
+      });
+    });
+  });
+});

src/common/utils/array.ts

@@ -19,26 +19,11 @@
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-export type Tuple<T, N extends number> = N extends N ? number extends N ? T[] : _TupleOf<T, N, []> : never;
-type _TupleOf<T, N extends number, R extends unknown[]> = R["length"] extends N ? R : _TupleOf<T, N, [T, ...R]>;
-
 /**
- *
- * @param sources The source arrays
- * @yields A tuple of the next element from each of the sources
- * @returns The tuple of all the sources as soon as at least one of the sources is exausted
+ * A inference typed version of `Array(length).fill(value)`
+ * @param length The number of entries
+ * @param value The value of each of the indices
  */
-export function* zipStrict<T, N extends number>(...sources: Tuple<T[], N>): Iterator<Tuple<T, N>, Tuple<T[], N>> {
-  const maxSafeLength = sources.reduce((prev, cur) => Math.min(prev, cur.length), Number.POSITIVE_INFINITY);
-
-  if (!isFinite(maxSafeLength)) {
-    // There are no sources, thus just return
-    return [] as Tuple<T[], N>;
-  }
-
-  for (let i = 0; i < maxSafeLength; i += 1) {
-    yield sources.map(source => source[i]) as Tuple<T, N>;
-  }
-
-  return sources.map(source => source.slice(maxSafeLength)) as Tuple<T[], N>;
+export function filled<T>(length: number, value: T): T[] {
+  return Array(length).fill(value);
 }

src/common/utils/index.ts

@@ -61,5 +61,12 @@ export * from "./convertCpu";
 
 import * as iter from "./iter";
 import * as array from "./array";
+import * as tuple from "./tuple";
+import * as string from "./string";
 
-export { iter, array };
+export {
+  iter,
+  array,
+  string,
+  tuple,
+};

src/common/utils/string.ts

@@ -0,0 +1,45 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * Create a new string that is `times` repetitions of `part`
+ * @param part The string segment to repeat
+ * @param times A non-negative count of repetitions.
+ */
+export function repeated(part: string, times: number): string {
+  function _repeated(part: string, times: number): string {
+    switch (times) {
+      case 0:
+        return "";
+      case 1:
+        return part;
+      case 2:
+        return part + part;
+      default:
+        const major = Math.pow(2, Math.floor(Math.log2(times)));
+        const majorString = _repeated(part, major / 2);
+
+        return majorString + majorString + _repeated(part, times - major);
+    }
+  }
+
+  return _repeated(part, Math.min(Number.MAX_SAFE_INTEGER, Math.max(0, Math.round(times))));
+}

src/common/utils/tuple.ts

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+import { array } from "../utils";
+
+/**
+ * A strict N-tuple of type T
+ */
+export type Tuple<T, N extends number> = N extends N ? number extends N ? T[] : _TupleOf<T, N, []> : never;
+type _TupleOf<T, N extends number, R extends unknown[]> = R["length"] extends N ? R : _TupleOf<T, N, [T, ...R]>;
+
+/**
+ * Iterates over `sources` yielding full tuples until one of the tuple arrays
+ * is empty. Then it returns a tuple with the rest of each of tuples
+ * @param sources The source arrays
+ * @yields A tuple of the next element from each of the sources
+ * @returns The tuple of all the sources as soon as at least one of the sources is exausted
+ */
+export function* zip<T, N extends number>(...sources: Tuple<T[], N>): Iterator<Tuple<T, N>, Tuple<T[], N>> {
+  const maxSafeLength = Math.min(...sources.map(source => source.length));
+
+  for (let i = 0; i < maxSafeLength; i += 1) {
+    yield sources.map(source => source[i]) as Tuple<T, N>;
+  }
+
+  return sources.map(source => source.slice(maxSafeLength)) as Tuple<T[], N>;
+}
+
+/**
+ * Returns a `length` tuple filled with copies of `value`
+ * @param length The size of the tuple
+ * @param value The value for each of the tuple entries
+ */
+export function filled<T, L extends number>(length: L, value: T): Tuple<T, L> {
+  return array.filled(length, value) as Tuple<T, L>;
+}

src/main/routes/metrics-route.ts

@@ -19,7 +19,6 @@
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-import _ from "lodash";
 import type { LensApiRequest } from "../router";
 import { respondJson } from "../utils/http-responses";
 import type { Cluster } from "../cluster";
@@ -33,8 +32,7 @@ export type IMetricsQuery = string | string[] | {
 };
 
 // This is used for backoff retry tracking.
-const MAX_ATTEMPTS = 5;
-const ATTEMPTS = [...(_.fill(Array(MAX_ATTEMPTS - 1), false)), true];
+const ATTEMPTS = [false, false, false, false, true];
 
 // prometheus metrics loader
 async function loadMetrics(promQueries: string[], cluster: Cluster, prometheusPath: string, queryParams: Record<string, string>): Promise<any[]> {

src/renderer/components/+user-management/+service-accounts/secret.tsx

@@ -25,7 +25,7 @@ import moment from "moment";
 import React from "react";
 
 import type { Secret } from "../../../../common/k8s-api/endpoints/secret.api";
-import { prevDefault } from "../../../utils";
+import { prevDefault, string } from "../../../utils";
 import { Icon } from "../../icon";
 
 interface Props {
@@ -49,7 +49,7 @@ export class ServiceAccountsSecret extends React.Component<Props, State> {
       <>
         {!showToken && (
           <>
-            <span className="asterisks">{Array(16).fill("•").join("")}</span>
+            <span className="asterisks">{string.repeated("•", 16)}</span>
             <Icon
               small material="lock_open"
               tooltip="Show value"

src/renderer/components/dock/log-list.tsx

@@ -32,7 +32,7 @@ import type { Align, ListOnScrollProps } from "react-window";
 
 import { SearchStore, searchStore } from "../../../common/search-store";
 import { UserStore } from "../../../common/user-store";
-import { boundMethod, cssNames } from "../../utils";
+import { array, boundMethod, cssNames } from "../../utils";
 import { Spinner } from "../spinner";
 import { VirtualList } from "../virtual-list";
 import { logStore } from "./log.store";
@@ -234,7 +234,7 @@ export class LogList extends React.Component<Props> {
   render() {
     const { isLoading } = this.props;
     const isInitLoading = isLoading && !this.logs.length;
-    const rowHeights = new Array(this.logs.length).fill(this.lineHeight);
+    const rowHeights = array.filled(this.logs.length, this.lineHeight);
 
     if (isInitLoading) {
       return (

src/renderer/components/table/sorting.ts

@@ -20,7 +20,7 @@
  */
 
 import type { TableSortCallback } from "./table";
-import { array, Ordering, rectifyOrdering, sortCompare } from "../../utils";
+import { Ordering, rectifyOrdering, sortCompare, tuple } from "../../utils";
 
 export function getSorted<T>(rawItems: T[], sortingCallback: TableSortCallback<T> | undefined, orderByRaw: string): T[] {
   if (typeof sortingCallback !== "function") {
@@ -40,7 +40,7 @@ export function getSorted<T>(rawItems: T[], sortingCallback: TableSortCallback<T
 
     const leftSortBy = [left.sortBy].flat();
     const rightSortBy = [right.sortBy].flat();
-    const zipIter = array.zipStrict(leftSortBy, rightSortBy);
+    const zipIter = tuple.zip(leftSortBy, rightSortBy);
     let r = zipIter.next();
 
     for (; r.done === false; r = zipIter.next()) {