Web Reference: These two keywords provide Block Scope in JavaScript. Variables declared with let and const inside a code block are "block-scoped," meaning they are only accessible within that block. Nov 13, 2023 ยท Local and Block Scope: Embrace local and block scope to keep variables isolated and contained. Use local scope within functions and block scope for variables within specific code blocks like loops and conditional statements. Mar 13, 2026 ยท In JavaScript, block scope refers to variables declared with let or const inside a { } block. These variables are accessible only within that block and not outside it.
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