JavaScript Core Concepts

Use `let` and `const` for variable declarations with an understanding of block scope.

Write and use arrow functions for callbacks and array methods.

Apply destructuring to extract values from objects and arrays efficiently.

Use the spread and rest operators to manipulate arrays and function arguments.

Import and export functionality between JavaScript files using ES6 modules.

Transform arrays using `map()`, `filter()`, and `reduce()` for common data manipulation tasks.

Chain array methods together to perform complex, multi-step data transformations.

Iterate over object properties using `Object.keys()`, `Object.values()`, and `Object.entries()`.