What is the difference between const and Object.freeze in JavaScript?
const prevents reassignment of the variable binding. Object.freeze prevents mutation of the object itself (no property changes). They work at different levels: const is about the variable, freeze is about the value.
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More FAQs in var vs let vs const: When to Use Each in JavaScript
Use const by default (most variables should not be reassigned). Use let when you need to reassign (counters, changing values). Avoid var in modern code; it is function-scoped and hoisted with undefined, which causes bugs.
No. const prevents reassignment of the variable, but you can still mutate the array or object (push, pop, property changes). Use Object.freeze() or immutable libraries for true immutability.
const. Each iteration of for...of creates a fresh binding, and the loop variable does not change within an iteration. Use let only for classic for loops where the counter increments.
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