"var vs let vs const" Code Answer's
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var vs let vs const
var:
- hoisted (always declared at top of scope, global if none)
- function scope
let:
- block scope
- not redeclarable
const:
- block scope
- not reassignable
- not redeclarable
Note: Although it may seem like these hold only semantic meaning, using the
appropriate keywords helps the JS engines' compiler to decide on what to optimize.
let vs const
`const` is a signal that the identifier won't be reassigned.
`let` is a signal that the variable may be reassigned, such as a counter in a
loop, or a value swap in an algorithm.
It also signals that the variable will be used only in the block it's defined
in, which is not always the entire containing function.
var 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
_____________________________________
Let --> is block level
for(let i = 0; i < 3; i++) {
console.log(i) --> it will console here
}
console.log(i) ---> Not here
---------------------------------------
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 here
var 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;
var vs let vs const typescript
let num1:number = 1;
function letDeclaration() {
let num2:number = 2;
if (num2 > num1) {
let num3: number = 3;
num3++;
}
while(num1 < num2) {
let num4: number = 4;
num1++;
}
console.log(num1); //OK
console.log(num2); //OK
console.log(num3); //Compiler Error: Cannot find name 'num3'
console.log(num4); //Compiler Error: Cannot find name 'num4'
}
letDeclaration();
Source: www.tutorialsteacher.com
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