JavaScript explain that how value should store in java script with out using datatype “var” or “let” explain value chain analysis,explain value,explain value added tax,

here i didn't understand what happen when i use var before variable in function it give me different out put and with out using var also i got a different output

here is a code that you can easily figure out whats going on

function value() {
  var m = 8; //here i am using var as a datatype  
  console.log(m)
}
m = 7
console.log(m);
value();
console.log(m);
Answer:1

Function looks for the m in the functional scope, if it does not find it there, it searches in the higher scope which over here is global scope.

In the first example, function creates a variable m in the function scope and any update will be limited to the variable in the function. So, basically in this example there are 2 variables, with one m belongs to the global scope and one m belongs to the function scope. See the interpretation of code below.

var m;
function value() {
  var m; // creates a variable m in the function scope
  m = 8;
  console.log(m)
}
m = 7
console.log(m);
value();
console.log(m);
Answer:2

Take a look at w3school's JavaScript Scope.

Below is example code of the difference of global variable and local variable.

function value() {
    // local variable in value()
    var m = 8;
    console.log("in value() : " + m)
}
function value2() {
    // set global variable as 9
    m = 9;
    console.log("in value2() : " + m)
}
// global variable
m = 7
console.log("before value() : " + m);
value();
console.log("after value() : " + m);
value2();
console.log("after value2() : " + m);
Answer:3

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