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"let in javascript
The let statement declares a block scope local variable, optionally initializing it to a value.
let x = 1;
if (x === 1) {
let x = 2;
console.log(x);
// expected output: 2
}
console.log(x);
// expected output: 1let javascript
* Variables defined with let cannot be redeclared.
* You cannot accidentally redeclare a variable.
let x = "John Doe";
let x = 0;
// SyntaxError: 'x' has already been declaredlet javascript
The let statement declares a block-scoped local variable,
optionally initializing it to a value.
let x=1;let javascript
var i = "global";
function foo() {
var i = "local"; // Otra variable local solo para esta función
console.log(i); // local
}
foo();
console.log(i); // globalCopyright © 2021 Codeinu
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