Introduction to Truthy and Falsy in JavaScript_javascript skills

Like most programming languages, there is a boolean type in JavaScript for logical judgment. However, unlike many other programming languages, JavaScript has the concepts of Truthy values ​​and Falsy values ​​- except for the boolean values ​​true and false, all types of JavaScript values ​​can be used for logical judgments. The rules are as follows:

1. All Falsy values ​​are false when making logical judgments. Falsy values ​​include: false, undefined, null, positive and negative 0, NaN, "".
2. All other values ​​are Truthy and are true when logical judgment is made. It is worth noting that Infinity, empty array, and "0" are all Truthy values.

Experiment