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Equality: == vs ===
Learn JavaScript equality: == vs ===, typeof quirks, and Object.is(). Understand type coercion and why NaN !== NaN.
Top 5 Programming Languages to Learn in 2025
A curated list of the best programming languages to learn in 2025, with reasons why they matter and Hello World code examples for each.
Type Coercion
Learn JavaScript type coercion. Understand how values convert to strings, numbers, and booleans, plus the 8 falsy values.
Primitives vs Objects: How JavaScript Values Actually Work
Learn how JavaScript primitives and objects differ in behavior. Understand immutability, call-by-sharing semantics, why mutation works but reassignment doesn't, and how V8 actually stores values.
Primitive Types
Learn JavaScript’s 7 primitive types: string, number, bigint, boolean, undefined, null, and symbol. Understand immutability, typeof quirks, and autoboxing..
Call Stack: How Function Execution Works
Learn how the JavaScript call stack works. Understand stack frames, LIFO ordering, execution contexts, and stack overflow errors.