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znzlcrstkk
Front End Web Development Techdegree Graduate 28,511 PointsThe boolean
Hello can somebody explain to me, what is all about, about boolean, so it's false and true, so what? what can i do with that, please give me detailed information with examples!
3 Answers
Matthew Caloger
12,903 PointsA boolean variable type is valuable when you have a situation that you want to be true OR false. Think of it as an on/off switch.
var isLightSwitchOn = false;
function flipLightSwitchOn() {
isLightSwitchOn = true;
}
While you could technically do the same thing with other types, such as setting a variable to either 1 or 0 for off/on, it's a much simpler and cleaner way to do it. You'll find that when your program complexity grows, constraints help with readability and understanding of your code and processes.
znzlcrstkk
Front End Web Development Techdegree Graduate 28,511 PointsHi, Matthew, can you give me example for situation, to be true or false?
Matthew Caloger
12,903 PointsHere's a few examples of booleans:
If you had an application with checkbox a user can check to remember their login username, the checkbox would have a checkbox.checked would be a boolean that could equate to true OR false.
As given above, a light-switch could also emulate a boolean concept, if the light-switch is up, lightOn would be true, if it's down, it would be false.
when you evaluate if-expressions, it checks for a boolean
if (x < 2) {code} , "x < 2" is actually checking a boolean value, true or false. The if-statement will only run the code if the value is true.
znzlcrstkk
Front End Web Development Techdegree Graduate 28,511 PointsMatthew this part of boolean I understand is this if (x < 2) {code), but I dont understand this part, when the boolean is used inside of the code it's like this >> a = true; or return true; So what a is true and return, returns true