add: do not use spread

standalone-apis/pure-nodejs-concepts/concepts/make-js-fast/do-not-use-spread.js

@@ -0,0 +1,32 @@
+/**
+ * ## Recommendation
+ * - Use mutable operations when performance is critical and immutability is unnecessary.
+ * - Use immutable patterns for reliability and maintainability when working in state-heavy applications like React, but optimize with tools like Immer for large data.
+ */
+const recommendation = {};
+
+// ------------------ Mutable
+
+const mutable = { name: 'Alice', age: 25 };
+mutable.age = 26;
+console.log('mutable', mutable);
+
+const mutable_arrays = [1, 2, 3];
+mutable_arrays.push(4);
+console.log('mutable_arrays', mutable_arrays);
+
+const largeArray = new Array(1_000_000).fill(0);
+largeArray[999_999] = 1;
+console.log('largeArray', largeArray);
+
+// ------------------ Immutable (Instead of mutating, create a new object or array)
+
+// Immutable update of an object
+const person = { name: 'Alice', age: 25 };
+const updatedPerson = { ...person, age: 26 };
+console.log('\nupdatedPerson', updatedPerson);
+
+// Immutable update of an array
+const numbers = [1, 2, 3];
+const updatedNumbers = [...numbers, 4];
+console.log('updatedNumbers', updatedNumbers);