Data types in Javascript are a little different compared to other programming languages like C or JAVA.<\/p>\n\n\n\n
JavaScript is a weakly typed language, this means that it is not necessary to define the data type. But it is not that it does not have types, since the data type is defined at run time by Javascript.<\/p>\n\n\n\n
This behavior and specification of data types applies to any place where javascript is executed, whether in the browser, in node.js, mongodb, or any tool that uses Javascript.<\/p>\n\n\n\n
Now if we analyze the concept of types a little, when you make a sum between numbers in the real world you don't care what type it is, you only care that they can be added, regardless of whether it is an integer or decimal. These subtypes of numbers are still part of the set of real numbers, and are used in real life. <\/p>\n\n\n\n
Javascript allows us to apply this thinking and with that we save many type comparisons. There will be times when we have no choice but to convert or compare them, but the less we do it, the simpler our code will be, and therefore easier to understand and faster to execute.<\/p>\n\n\n\n
It is said that Javascript has a dynamic data type system, this is because the variables that are created can receive any other type of data at any time, and change type depending on the value they store. What we are really interested in is the value and what we can do with that value, not so much the type. <\/p>\n\n\n\n
Later we will see some conversions and comparisons that can confuse and complicate the code, the recommendation is to reduce their use as much as possible. Although we will not see each type in great detail, we will see more important things necessary to use data types in Javascript.<\/p>\n\n\n\n