diff --git a/readme.md b/readme.md
index 4946ee3..becd297 100644
--- a/readme.md
+++ b/readme.md
@@ -25,6 +25,7 @@ Javascript utility functions for web development
 * [min-max](https://gen-tech.github.io/js-utils/modules/_min_max_.html)
 * [noop](https://gen-tech.github.io/js-utils/modules/_noop_.html)
 * [promise-timeout](https://gen-tech.github.io/js-utils/modules/_promise_timeout_.html)
+* [replace](https://gen-tech.github.io/js-utils/modules/_replace_.html)
 * [revert-promise](https://gen-tech.github.io/js-utils/modules/_revert_promise_.html)
 * [unique-id](https://gen-tech.github.io/js-utils/modules/_unique_id_.html)
 
diff --git a/src/as-proto/array-replace.spec.ts b/src/as-proto/array-replace.spec.ts
new file mode 100644
index 0000000..0ee6411
--- /dev/null
+++ b/src/as-proto/array-replace.spec.ts
@@ -0,0 +1,23 @@
+import { expect } from 'chai';
+import 'mocha';
+
+import "./array-replace";
+import { replace } from "../replace";
+
+describe('Array Replace Proto Function', () => {
+  it('should work as same', () => {
+    const foo = [1, 2, 3, 1, 2, 3];
+
+    expect(foo.replace(2, 100)).to.eql(replace(foo, 2, 100));
+    expect(foo.replace(4, 100)).to.eql(replace(foo, 4, 100));
+
+    const itemOptions = {startingIndex: 2, deleteCount: 2, itemsToReplace: [100, 101]};
+    expect(foo.replace(itemOptions)).to.eql(replace(foo, itemOptions));
+
+    const mapOptions = {itemsToReplace: new Map([[2, 100], [3, 101]])};
+    expect(foo.replace(mapOptions)).to.eql(replace(foo, mapOptions));
+
+    const mapOptionsMulti = {itemsToReplace: new Map([[2, 100], [3, 101]]), multi: true};
+    expect(foo.replace(mapOptionsMulti)).to.eql(replace(foo, mapOptionsMulti));
+  });
+});
diff --git a/src/as-proto/array-replace.ts b/src/as-proto/array-replace.ts
new file mode 100644
index 0000000..883f9c7
--- /dev/null
+++ b/src/as-proto/array-replace.ts
@@ -0,0 +1,79 @@
+import { replace, ReplaceItemsOptions, ReplaceByMapOptions } from "../replace";
+
+declare global {
+  export interface Array<T> {
+    /**
+     * #### Replace
+     *
+     * Replaces an item with passed one of an array
+     *
+     * * * *
+     * Example:
+     * ```typescript
+     * import "@gen-tech/js-utils/dist/as-proto/array-replace";
+     *
+     * const array = ["a", "b", "c", "a", "b", "c"];
+     *
+     * array.replace("b", "x"); // ["a", "x", "c", "a", "b", "c"]
+     * ```
+     * * * *
+     * @param array Array to replace its item
+     * @param itemToRemove Item to remove
+     * @param itemToReplace Item to replace with
+     * @return New replaced array
+     */
+    replace(itemToRemove: T, itemToReplace: T): T[];
+
+    /**
+     * #### Replace
+     *
+     * Deletes items and replaces new ones from passed starting index of an array
+     *
+     * * * *
+     * Example:
+     * ```typescript
+     * import "@gen-tech/js-utils/dist/as-proto/array-replace";
+     *
+     * const array = ["a", "b", "c", "a", "b", "c"];
+     *
+     * array.replace({startingIndex: 3, deleteCount: 1, itemsToReplace: ['x', 'y']}); // ["a", "b", "c", "x", "y", "b", "c"];
+     * ```
+     * * * *
+     * @param array Array to replace its item
+     * @param replaceOptions Replace options
+     * @template T Typeof array items
+     * @return New replaced array
+     */
+    replace(replaceOptions: ReplaceItemsOptions<T>): T[];
+
+    /**
+     * #### Replace
+     *
+     * Deletes items and replaces new ones by passed matcher map
+     *
+     * * * *
+     * Example:
+     * ```typescript
+     * import "@gen-tech/js-utils/dist/as-proto/array-replace";
+     *
+     * const array = ["a", "b", "c", "a", "b", "c"];
+     * const map = new Map();
+     * map.set("a", "x")
+     * map.set("b", "y");
+     *
+     * array.replace({itemsToReplace: map}); // ["x", "y", "c", "a", "b", "c"];
+     * array.replace({itemsToReplace: map, multi: true}); // ["x", "y", "c", "x", "y", "c"];
+     * ```
+     * * * *
+     * @param array Array to replace its item
+     * @param replaceOptions Replace options
+     * @template T Typeof array items
+     * @return New replaced array
+     */
+    replace(replaceOptions: ReplaceByMapOptions<T>): T[];
+  }
+}
+
+Array.prototype.replace = <any>function<T>(options: T | ReplaceItemsOptions<T> | ReplaceByMapOptions<T>, itemToReplace: T): T[] {
+  return replace.call(null, this, ...arguments);
+}
diff --git a/src/index.ts b/src/index.ts
index 6d54de4..8a35354 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -10,4 +10,6 @@ export * from "./min-max";
 export * from "./noop";
 export * from "./open-promise";
 export * from "./promise-timeout";
+export * from "./replace";
+export { revertPromise } from "./revert-promise";
 export * from "./unique-id";
diff --git a/src/replace.spec.ts b/src/replace.spec.ts
new file mode 100644
index 0000000..cf6c42f
--- /dev/null
+++ b/src/replace.spec.ts
@@ -0,0 +1,44 @@
+import { expect } from 'chai';
+import 'mocha';
+
+import { replace } from "./replace";
+
+describe('Replace Function', () => {
+  let foo: number[];
+
+  beforeEach(() => {
+    foo = [1, 2, 3, 1, 2, 3];
+  });
+
+  it('should replace one item successfully', () => {
+    expect(replace(foo, 2, 100)).to.eql([1, 100, 3, 1, 2, 3]);
+  });
+
+  it('shouldn\'t replace nonfound item', () => {
+    expect(replace(foo, 4, 100)).to.eql([1, 2, 3, 1, 2, 3]);
+  });
+
+  it('should replace items from index 0 when startingIndex is not defined', () => {
+    expect(replace(foo, {itemsToReplace: [100]})).to.eql([100, 2, 3, 1, 2, 3]);
+  });
+
+  it('should add items when itemsToReplace array contains multiple elements', () => {
+    expect(replace(foo, {itemsToReplace: [100, 101, 102]})).to.eql([100, 101, 102, 2, 3, 1, 2, 3]);
+  });
+
+  it('should delete items as defined', () => {
+    expect(replace(foo, {itemsToReplace: [100], deleteCount: 2})).to.eql([100, 3, 1, 2, 3]);
+  });
+
+  it('should start replacing from startingIndex', () => {
+    expect(replace(foo, { startingIndex: 2, itemsToReplace: [100]})).to.eql([1, 2, 100, 1, 2, 3]);
+  });
+
+  it('should replace by using mode: `replace by map`', () => {
+    expect(replace(foo, {itemsToReplace: new Map([[2, 100]])})).to.eql([1, 100, 3, 1, 2, 3]);
+  });
+
+  it('should replace multiple when multi set as true', () => {
+    expect(replace(foo, {itemsToReplace: new Map([[2, 100]]), multi: true})).to.eql([1, 100, 3, 1, 100, 3]);
+  });
+});
diff --git a/src/replace.ts b/src/replace.ts
new file mode 100644
index 0000000..822d6b5
--- /dev/null
+++ b/src/replace.ts
@@ -0,0 +1,226 @@
+/**
+ * Replace Items Options Interface
+ *
+ * @template T typeof the items of the array
+ */
+export interface ReplaceItemsOptions<T> {
+  /**
+   * Starting index of the array for replacement operation
+   *
+   * @default 0
+   */
+  startingIndex?: number;
+
+  /**
+   * Determines how many items will be deleted from the array
+   *
+   * @default 1
+   */
+  deleteCount?: number;
+
+  /**
+   * Items to replace
+   *
+   * @default []
+   */
+  itemsToReplace?: T[];
+}
+
+/**
+ * Replace by Item Matcher Map Options Interface
+ *
+ * @template T typeof the items of the array
+ */
+export interface ReplaceByMapOptions<T> {
+  /**
+   * Items' Matcher Map to replace
+   */
+  itemsToReplace: Map<T, T>;
+
+  /**
+   * Set as `true` to replace all items in the array if matches with the key of the matcher map while iterating
+   *
+   * @default false
+   */
+  multi?: boolean;
+}
+
+/**
+ * Default Options for Replace Items Mode
+ */
+const REPLACE_ITEMS_DEFAULT_OPTIONS: Required<ReplaceItemsOptions<any>> = {
+  deleteCount: 1,
+  itemsToReplace: [],
+  startingIndex: 0
+};
+
+/**
+ * Default Options for Replace By Map Mode
+ */
+const REPLACE_BY_MAP_DEFAULT_OPTIONS: Required<ReplaceByMapOptions<any>> = {
+  itemsToReplace: new Map(),
+  multi: false
+};
+
+/**
+ * #### Replace
+ *
+ * Replaces an item with passed one of an array
+ *
+ * * * *
+ * Example:
+ * ```typescript
+ * import { replace } from "@gen-tech/js-utils";
+ *
+ * const array = ["a", "b", "c", "a", "b", "c"];
+ *
+ * replace(array, "b", "x"); // ["a", "x", "c", "a", "b", "c"]
+ * ```
+ * Array Prototype Example:
+ * ```typescript
+ * import "@gen-tech/js-utils/dist/as-proto/array-replace";
+ *
+ * const array = ["a", "b", "c", "a", "b", "c"];
+ *
+ * array.replace("b", "x"); // ["a", "x", "c", "a", "b", "c"]
+ * ```
+ * * * *
+ * @param array Array to replace its item
+ * @param itemToRemove Item to remove
+ * @param itemToReplace Item to replace with
+ * @template T Typeof array items
+ * @return New replaced array
+ */
+export function replace<T>(array: T[], itemToRemove: T, itemToReplace: T): T[];
+/**
+ * #### Replace
+ *
+ * Deletes items and replaces new ones from passed starting index of an array
+ *
+ * * * *
+ * Example:
+ * ```typescript
+ * import { replace } from "@gen-tech/js-utils";
+ *
+ * const array = ["a", "b", "c", "a", "b", "c"];
+ *
+ * replace(array, {startingIndex: 3, deleteCount: 1, itemsToReplace: ['x', 'y']}); // ["a", "b", "c", "x", "y", "b", "c"];
+ * ```
+ * Array Prototype Example:
+ * ```typescript
+ * import "@gen-tech/js-utils/dist/as-proto/array-replace";
+ *
+ * const array = ["a", "b", "c", "a", "b", "c"];
+ *
+ * array.replace({startingIndex: 3, deleteCount: 1, itemsToReplace: ['x', 'y']}); // ["a", "b", "c", "x", "y", "b", "c"];
+ * ```
+ * * * *
+ * @param array Array to replace its item
+ * @param replaceOptions Replace options
+ * @template T Typeof array items
+ * @return New replaced array
+ */
+export function replace<T>(array: T[], replaceOptions: ReplaceItemsOptions<T>): T[];
+/**
+ * #### Replace
+ *
+ * Deletes items and replaces new ones by passed matcher map
+ *
+ * * * *
+ * Example:
+ * ```typescript
+ * import { replace } from "@gen-tech/js-utils";
+ *
+ * const array = ["a", "b", "c", "a", "b", "c"];
+ * const map = new Map();
+ * map.set("a", "x")
+ * map.set("b", "y");
+ *
+ * replace(array, {itemsToReplace: map}); // ["x", "y", "c", "a", "b", "c"];
+ * replace(array, {itemsToReplace: map, multi: true}); // ["x", "y", "c", "x", "y", "c"];
+ * ```
+ * Array Prototype Example:
+ * ```typescript
+ * import "@gen-tech/js-utils/dist/as-proto/array-replace";
+ *
+ * const array = ["a", "b", "c", "a", "b", "c"];
+ * const map = new Map();
+ * map.set("a", "x")
+ * map.set("b", "y");
+ *
+ * array.replace({itemsToReplace: map}); // ["x", "y", "c", "a", "b", "c"];
+ * array.replace({itemsToReplace: map, multi: true}); // ["x", "y", "c", "x", "y", "c"];
+ * ```
+ * * * *
+ * @param array Array to replace its item
+ * @param replaceOptions Replace options
+ * @template T Typeof array items
+ * @return New replaced array
+ */
+export function replace<T>(array: T[], replaceOptions: ReplaceByMapOptions<T>): T[];
+export function replace<T>(
+  array: T[],
+  options: T | ReplaceItemsOptions<T> | ReplaceByMapOptions<T>,
+  itemToReplace?: T
+): T[] {
+  if (arguments.length > 2) {
+    options = <ReplaceItemsOptions<T>>{
+      startingIndex: array.indexOf(<T>options),
+      itemsToReplace: [itemToReplace]
+    };
+  }
+
+  if ((<ReplaceByMapOptions<T> | ReplaceItemsOptions<T>>options).itemsToReplace instanceof Array) {
+    return _replaceItems(array, <ReplaceItemsOptions<T>>options);
+  } else {
+    return _replaceByMap(array, <ReplaceByMapOptions<T>>options);
+  }
+}
+
+/**
+ * Replace items by 'replace items' mode
+ *
+ * @param array Array to replace items
+ * @param options Replace options
+ */
+function _replaceItems<T>(array: T[], options: ReplaceItemsOptions<T>): T[] {
+  const { startingIndex, deleteCount, itemsToReplace}: Required<ReplaceItemsOptions<T>> = Object.assign({}, REPLACE_ITEMS_DEFAULT_OPTIONS, options);
+
+  const newArray = [...array];
+
+  // If item not found or index number is negative; do nothing
+  if (startingIndex < 0) {
+    return newArray;
+  }
+
+  newArray.splice(startingIndex, deleteCount, ...itemsToReplace);
+
+  return newArray;
+}
+
+/**
+ * Replace items by 'replace by map' mode
+ *
+ * @param array Array to replace items
+ * @param options Replace options
+ */
+function _replaceByMap<T>(array: T[], options: ReplaceByMapOptions<T>): T[] {
+  const { itemsToReplace, multi }: Required<ReplaceByMapOptions<T>> = Object.assign({}, REPLACE_BY_MAP_DEFAULT_OPTIONS, options);
+  const iterationMethod = multi ? Array.prototype.forEach : Array.prototype.some;
+
+  const newArray = [...array];
+
+  itemsToReplace.forEach((value, key) => {
+    iterationMethod.call(newArray, (item, index) => {
+      const matches = item === key;
+
+      if (matches) {
+        newArray.splice(index, 1, value);
+      }
+
+      return matches;
+    });
+  });
+
+  return newArray;
+}
diff --git a/tsconfig.json b/tsconfig.json
index a1e1c8f..bd826f7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,6 +12,7 @@
     "allowSyntheticDefaultImports": true,
     "declaration": true,
     "noResolve": false,
+    "downlevelIteration": true,
     "lib": [
       "dom",
       "es2015"