In JavaScript, var, let, and const are used to declare variables, The main difference are as follows. Scope var: Variables declared with var are function scoped. They are visible throughout the whole function in which they are declared. If declared outside any function, they become global...
4. The'const'Keyword Theconstkeyword follows same rules asletkeyword. Only difference is thatconstis used to drfine constants in the program. 4.1. Block Scoped Theconstkeyword declares a block-scoped variable with a constant value. It is basically variable declaration with ‘let‘ keyword wherev...
var 是全局scope或函数 scope; let, const 是 block scope; 全局作用域里面定义的 const, let 不会挂载到 window 对象上面; 全局作用域里面定义的 var 会挂载到 window 对象上面; constlog =console.log;vara =1;log(`a =`,window.b);letb =1;log(`b =`,window.b);constc =1;log(`c =`,window...
Check out my other JavaScript articles here: Difference Between let, var, and const in JavaScript with Example Count Number Of Character Occurrences In A String Using JavaScript If you'd like to explore more articles, please Clcik Here Comparison in javascript JavaScript JavaScript equality operators...
A variable is a name of a memory location. Users can declare a variable using three keywords, let, var and const, inJavaScript. But there are some significant differences between var, let, and const keywords, which we will discuss in this article. We will also explain the scope of each ...
let foo = function() { console.log('foo'); } // SyntaxError: Identifier 'foo' has already been declared let foo = function() { console.log('bar'); } const foo = function() { console.log('foo'); } // SyntaxError: Identifier 'foo' has already been declared var f...
So, what is the difference between a normal function and an arrow function? 🤔️ 1. this points to In JavaScript, thethisis a basic and important knowledge point. 1.1 Ordinary functions In ordinary functions,thisis dynamic, and its value depends on how the function is called. There are...
Learn the key differences between static and const in JavaScript, including their definitions, use cases, and examples to enhance your coding skills.
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const diff = endDate.diff(startDate) const diffDuration = moment.duration(diff) const subtractStartDate = startDate.subtract(diff) console.log({subtractStartDate}) return subtractStartDate } Some more clarification Assuming there is a 3-day time difference betweenstartDateandendDate, and(17-6-...