4.3.2. Evaluating Variables¶
/*When we refer to a variable name, we are evaluating the variable.
The effect is just as if the value of the variable is substituted
for the variable name in the code when executed.*/
let message = "What's up, Doc?";
let n = 17;
let pi = 3.14159;
console.log(message);
console.log(n);
console.log(pi);
//What's up, Doc?
//17
//3.141594.3.2. Evaluating Variables¶
/*Like values, variables also have types. We determine the type of a
variable the same way we determine the type of a value, using typeof.*/
let message = "What's up, Doc?";
let n = 17;
let pi = 3.14159;
console.log(typeof message);
console.log(typeof n);
console.log(typeof pi);
//string
//number
//number4.3.2. Evaluating Variables¶
/*After a variable has been created, it may be used later in a program
anywhere a value may be used. For example, console.log prints a value,
we can also give console.log a variable.*/
//These two examples have the exact same output.
console.log("Hello, World!");
let message = "Hello, World!";
console.log(message);Copyright © 2021 Codeinu
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