var vs let js
let: //only available inside the scope it's declared, like in "for" loop,
var: //accessed outside the loop "for"var vs let js
let: //only available inside the scope it's declared, like in "for" loop,
var: //accessed outside the loop "for"const let var scope
var num = 1; //var can be function or global scoped
const num = 2; //const can only be block scoped
let num = 3; //let can only be block scopedvar let const javascript
Const vs Let vs Var
const pi = 3.14
pi = 1
cannot do this becuase with const you cannot change the value
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Let --> is block level
for(let i = 0; i < 3; i++) {
console.log(i) --> it will console here
}
console.log(i) ---> Not here
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Var is for variables available to the entire function
for(var j = 0; j < 3; j++) {
console.log(j) --> it will console here
}
console.log(j) ---> it will console herevar or const in javascript
// var declares a variable, meaning its value will vary.
// const declares a constant, meaning its value will remain
// consistant and not change.
// If your variable changes throughout the program or website,
// declare it using a var statement.
// Otherwise, if its value does not change, declare it using
// a const statement.
const myConst='A const does not change.';
var myVar='A var does change.';
var myVar=2;const let var
var makes real ice cubes that rattle around in New York
let makes real ice cubes in Manhatten
const is like let but the ice cubes never change because they are plasticconst let var
var greeter;
console.log(greeter); // greeter is undefined
greeter = "say hello"Copyright © 2021 Codeinu
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