immutable-js
diff --git a/‎src/functional/removeIn.js
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diff --git a/‎src/functional/removeIn.ts
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diff --git a/‎src/functional/setIn.js
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diff --git a/‎src/functional/setIn.ts
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+import { updateIn, type PossibleCollection } from './updateIn';
+import { NOT_SET } from '../TrieUtils';
+import type { KeyPath } from '../../type-definitions/immutable';
+
+/**
+ * Returns a copy of the collection with the value at the key path removed.
+ *
+ * A functional alternative to `collection.removeIn(keypath)` which will also
+ * work with plain Objects and Arrays.
+ *
+ * <!-- runkit:activate -->
+ * ```js
+ * import { removeIn } from 'immutable';
+ *
+ * const original = { x: { y: { z: 123 }}}
+ * removeIn(original, ['x', 'y', 'z']) // { x: { y: {}}}
+ * console.log(original) // { x: { y: { z: 123 }}}
+ * ```
+ */
+export function removeIn<
+  K extends PropertyKey,
+  V,
+  TProps extends object,
+  C extends PossibleCollection<K, V, TProps>,
+>(collection: C, keyPath: KeyPath<K>): C {
+  return updateIn(collection, keyPath, () => NOT_SET);
+}
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+import { updateIn, type PossibleCollection } from './updateIn';
+import { NOT_SET } from '../TrieUtils';
+import type { KeyPath } from '../../type-definitions/immutable';
+
+/**
+ * Returns a copy of the collection with the value at the key path set to the
+ * provided value.
+ *
+ * A functional alternative to `collection.setIn(keypath)` which will also
+ * work with plain Objects and Arrays.
+ *
+ * <!-- runkit:activate -->
+ * ```js
+ * import { setIn } from 'immutable';
+ *
+ * const original = { x: { y: { z: 123 }}}
+ * setIn(original, ['x', 'y', 'z'], 456) // { x: { y: { z: 456 }}}
+ * console.log(original) // { x: { y: { z: 123 }}}
+ * ```
+ */
+export function setIn<
+  K extends PropertyKey,
+  V,
+  TProps extends object,
+  C extends PossibleCollection<K, V, TProps>,
+>(collection: C, keyPath: KeyPath<K>, value: unknown): C {
+  return updateIn(collection, keyPath, NOT_SET, () => value);
+}