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1 lut 2009 · let: creates a block scoped variable; const: creates a block scoped variable which has to be initialized and cannot be reassigned; The biggest difference between var and let/const is that var is function scoped whereas let/const are block scoped. Here is an example to illustrate this:
Interviewers often ask this question to gauge your knowledge of scope and hoisting. Here’s what you need to know: Answer: var is function-scoped and can be redeclared. It’s hoisted, meaning it can be used before declaration (though the value will be undefined). let and const are block-scoped and cannot be redeclared within the same scope.
15 wrz 2023 · Variable Scope and Assignment: When var a = b = 5; is executed, the following happens: var a is correctly declared and assigned the value 5 within the function's scope. b = 5 assigns...
11 cze 2024 · Master the concept of variable scope in JavaScript with our in-depth coverage of var, let, and const and prepare for top interview questions.
13 lis 2023 · What is Scope? At its core, scope in JavaScript refers to the context or environment in which variables are declared and can be accessed. It dictates the visibility and lifetime of a variable, determining where in your code a particular variable is valid and accessible.
2 maj 2024 · The scope of a variable in JavaScript is the part of the code where the variable can be accessed. Variables declared with the var keyword have a local scope, which means that they can only be accessed within the block of code where they are declared.
13 mar 2020 · Variables and functions that have global scope are accessible everywhere in the script or module file. For example, we can declare a variable with global scope as follows: var global = 'global'; const foo = () => {. console.log(global); const bar = () => {. console.log(global); }
