Posts tagged with

JavaScript

Stop memorizing the difference between __proto__ and prototype. Starting from what `new` really does, we break down why the prototype chain exists, how it saves memory, and the real mechanics behind class syntactic sugar.

Breaking down the four-step internal process of the `new` operator, revealing that `class` is essentially syntactic sugar over `function` + prototype binding.

call passes args with commas, apply passes args as an array, bind does not execute immediately. A crisp cheat sheet for the three hard-binding methods.

Stop memorizing rules. Starting from what `this` really means, we break down the four invocation patterns, the classic `this`-loss pitfall in classes, the essence of arrow functions, and when you should—and shouldn't—use them.

Hand-implementing JavaScript array core methods — forEach, map, filter, reduce — mounted on the prototype chain.