JavaScript const vs let vs var: When to Use Which? (2026 Tutorial)
Confused about when to use const, let, or var in JavaScript? In this tutorial, we clarify the rules of const variables, why they prevent bugs, and how to choose the right keyword for your code.
Master variable declaration in JavaScript:
[00:00] Introduction to JavaScript const
[00:21] What is const and how is it block-scoped?
[00:36] Understanding immutable values
[01:23] Practical demo: Declaring a const variable
[02:39] What happens when you try to change a const?
[03:29] Redeclaration errors: var vs let vs const
[05:16] Summary: When to use which variable keyword
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