In this article we explore the let keyword in JavaScript, which declares block-scoped variables. We'll examine its behavior and advantages. The let keywordThe let keyword declares variables that are limited to
一、JavaScript关键字是什么Javascript关键字（Keyword）是指在Javascript语言中有特定含义，成为Javascript语法...
Example carName ="Saab"; letcarName ="Volvo"; Try it Yourself » Exercise? What is a correct use of theletkeyword? let x = 5; x let 5; let 5 into x; x = 5(let); Submit Answer » Video: JavaScript let
console.log(a); // Output --> 10 // Users cannot re-declare the variable defined with the let keyword but can update it. let a = 20 // Output --> Error a = 20 // Output --> 20 // Users can declare the variable with the same name in different blocks using the let keyword....
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6 JavaScript has had var from the beginning, so they just needed another keyword, 7 and just borrowed from dozens of other languages that use let already as a traditional keyword as close to var as possible, 8 although in JavaScript let creates block scope local variable instead. ...
1. Using letrequirescode to be run in stict mode 2. Variable leaking in block-level scope A pair of braces will create a block-level scope,which is similar to function-level scope. Inthisscope,Avariable declared withthelet keyword isalocal variable instead of global variable. All the code...
errors and optimize code better.6JavaScript has hadvarfrom the beginning, so they just needed another keyword,7and just borrowed from dozens of other languages that use let already as a traditional keyword as close tovaras possible,8althoughinJavaScript let creates block scope local variable ...
[Javascript] let doesn't hoist -- false "let" keyword, the same as "const" does hoist the variable. But different from 'var', it does both hoist and assign value as "undefined". "let" in other hand, it just hoist the variable, but doesn't assign and value until runtime code is...
// bad (function example() { // JavaScript interprets this as // let a = ( b = ( c = 1 ) ); // The let keyword only applies to variable a; variables b and c become // global variables. let a = b = c = 1; }()); console.log(a); // throws ReferenceError console.log...