js let vs const vs var code example
Example 1: 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
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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 here
Example 2: const let var scope
var num = 1;
const num = 2;
let num = 3;
Example 3: var or const in javascript
const myConst='A const does not change.';
var myVar='A var does change.';
var myVar=2;
Example 4: 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);
console.log(num2);
console.log(num3);
console.log(num4);
}
letDeclaration();