feat: add repeat()

projects/micro-dash/src/lib/string/index.ts

@@ -5,6 +5,7 @@ export { lowerFirst } from "./lower-first";
 export { pad } from "./pad";
 export { padStart } from "./pad-start";
 export { padEnd } from "./pad-end";
+export { repeat } from "./repeat";
 export { snakeCase } from "./snake-case";
 export { toLower } from "./to-lower";
 export { upperFirst } from "./upper-first";

projects/micro-dash/src/lib/string/repeat.spec.ts

@@ -0,0 +1,27 @@
+import { repeat } from "./repeat";
+
+describe("repeat()", () => {
+  //
+  // stolen from https://github.com/lodash/lodash
+  //
+
+  const str = "abc";
+
+  it("should repeat a string `n` times", () => {
+    expect(repeat("*", 3)).toBe("***");
+    expect(repeat(str, 2)).toBe("abcabc");
+  });
+
+  it("should return an empty string if `n` is <= `0`", () => {
+    expect(repeat(str, 0)).toBe("");
+    expect(repeat(str, -2)).toBe("");
+  });
+
+  it("should coerce `n` to an integer", () => {
+    expect(repeat(str, 2.6)).toBe("abcabc");
+  });
+
+  it("should return an empty string for empty values", () => {
+    expect(repeat("", 2)).toBe("");
+  });
+});

projects/micro-dash/src/lib/string/repeat.ts

@@ -0,0 +1,15 @@
+/**
+ * Repeats the given string `n` times.
+ *
+ * Differences from lodash:
+ * - does not work as an iteratee for methods like `map`
+ *
+ * Contribution to minified bundle size, when it is the only function imported:
+ * - Lodash: 2,467 bytes
+ * - Micro-dash: 62 bytes
+ */
+// tslint:disable-next-line:variable-name
+export function repeat(string: string, n: number) {
+  // tslint:disable-next-line:no-bitwise
+  return n < 0 ? "" : new Array(n | 0).fill(string).join("");
+}

projects/sizes/src/lib/string/index.lodash.ts

@@ -5,6 +5,7 @@ import "./lower-first.lodash";
 import "./pad-end.lodash";
 import "./pad-start.lodash";
 import "./pad.lodash";
+import "./repeat.lodash";
 import "./snake-case.lodash";
 import "./to-lower.lodash";
 import "./upper-first.lodash";

projects/sizes/src/lib/string/index.microdash.ts

@@ -5,6 +5,7 @@ import "./lower-first.microdash";
 import "./pad-end.microdash";
 import "./pad-start.microdash";
 import "./pad.microdash";
+import "./repeat.microdash";
 import "./snake-case.microdash";
 import "./to-lower.microdash";
 import "./upper-first.microdash";

projects/sizes/src/lib/string/repeat.lodash.ts

@@ -0,0 +1,3 @@
+import repeat from "lodash-es/repeat";
+
+console.log(repeat("hi", 3), repeat("", -1));

projects/sizes/src/lib/string/repeat.microdash.ts

@@ -0,0 +1,3 @@
+import { repeat } from "micro-dash";
+
+console.log(repeat("hi", 3), repeat("", -1));