Feat typescript/str split

typescript/src/string/index.ts

@@ -2,3 +2,4 @@ export * from "./explode";
 export * from "./implode";
 export * from "./str_repeat";
 export * from "./chr";
+export * from "./str_split";

typescript/src/string/str_split.test.ts

@@ -0,0 +1,25 @@
+import { str_split } from "./str_split";
+
+const str = "Hello World!";
+
+describe("string split", () => {
+  it("should be able to return every letter as element of the array", () => {
+    expect(str_split(str)).toEqual(
+        ["H", "e", "l", "l", "o", " ", "W", "o", "r", "l", "d", "!"]
+    );
+  });
+
+  it("should be able to return 2 or more letter as element of the array depend on number of len", () => {
+    expect(str_split(str, 2)).toEqual(["He", "ll", "o ", "Wo", "rl", "d!"]);
+    expect(str_split(str, 3)).toEqual(["Hel", "lo ", "Wor", "ld!"]);
+    expect(str_split(str, 4)).toEqual(["Hell", "o Wo", "rld!"]);
+  });
+
+  it("should be able to return false", () => {
+    expect(str_split(str, -1)).toEqual(false);
+  });
+
+  it("should be able to return the entire string as the only element of the array", () => {
+    expect(str_split(str, 15)).toEqual(["Hello World!"]);
+  });
+});

typescript/src/string/str_split.ts

@@ -0,0 +1,31 @@
+/**
+ * str_split — Convert a string to an array
+ * @param str - The string to be convert.
+ * @param len - Maximum length of the chunk.
+ * @returns If the optional length parameter is specified, the returned array will be broken down into chunks with each being length in length, except the final chunk which may be shorter if the string does not divide evenly. The default length is 1, meaning every chunk will be one byte in size.
+ */
+export const str_split = (str: string, len?: number): string[] | false => {
+    if (typeof str === "undefined" || typeof str !== "string") return false;
+    if (typeof len !== "undefined" && typeof len === "number") {
+        if (len < 0) return false;
+
+        const arr: string[] = [];
+        let result = "";
+        let counter = 0;
+        for (let i=0; i<str.length; i++) {
+            result = result + str[i];
+            counter++;
+
+            if (counter === len || i === str.length - 1) {
+                arr.push(result);
+                result = "";
+                counter = 0;
+            }
+        }
+
+        return arr;
+    }
+
+    return str.split("");
+};
+