Advertisements I have a list which is returning [null] but I want to replace that with [] I’m using useEffect() but I’m literally not able to find an expression that returns true when compared with null. I’ve tried: listToCompare === null // false listToCompare[0] === null // false listToCompare === undefined // false listToCompare ===… Read More How do i compare a [null] list?

Advertisements I hope some can help me with a beginner question (this is specifically running on Arduino, but I suspect it is a much more fundamental C++ question than that). I do not understand why the following "switch" statement outputs both "Channel 1" and "Channel 2" statements: void setup() { delay(100); Serial.begin(57600); delay(100); int channel… Read More Why does the second expression also evaluate to true in this "switch" statement?

Advertisements How to build an expression which will produce the following statement? x => x.Parameter1 == "Some text" || x.Parameter2 == "Some text" || x.Parameter3 == "Some text" It’s not hard to do x =>, but how to create those many OR operators? I know we have Expression.Or method, but it only accepts 2 arguments.… Read More Multiple Expression.Or

Advertisements The following works: let x = 1 && console.log("true"); (– logs true) let y = 0 && console.log("true"); (– logs nothing) The above shows that the statement before && operator is acting like an expression. Then I tried this: console.log(let m = 5); // Error What is going on here? If that’s an expression… Read More Is Variable Initialization statement an expression in JavaScript?

Advertisements I have a string that will be used in an oracle query that I need to parse and change the alias of the columns in the string to a different value and I need to use a regular expression to do so. Here is an example of the sort of string I will be… Read More Regular expression to capture alias in a string to be used in an oracle query without capturing characters that are the same as the alias

Advertisements am trying to build a regex code to allow such texts iGuKiscdvMrrSCaKGdmePT5ASu6gRJBHoB iPokbyeGPuF46B27dAY3fRZAkKdDh8WbNr iJhZPxQp7fWQCBvmyTFLAFs9Q8kWWEJHfi iKs7Kv9gaLCoJVXvnPkqf4peXFqZrCG1G4 iJRXgmaiwQ5r6NnxDcFgT2yBpjtWB1y5vM starts with letter i and contain numbers and letters a-z A-z with no special characters what is the correct regex >Solution : Looks like you’re looking for the regex ^i[A-za-z0-9]+$ Where the ^ means that the line is… Read More regular expression code containing letters and numbers

Advertisements Still getting used to the formatting when writing C++ code, come from a Lua background. How do I correctly format a if/conditional expressions as my example highlights below. This will correctly run, but with warnings which is unideal: return (boolean == true) and init() or 0; Highlighted Warning: expected a ‘;’C/C++ (between "(boolean ==… Read More Return Expression Check Condition in C++

Advertisements Is there a way in Javascript to make an Object containing expressions of both classes and subclasses of it? I tried this way, but I guess I can’t refer to the superclass this way. const myClasses = { ‘animal’: class { a; b; constructor(x, y) { this.a = x; this.a = y; } },… Read More Object of class and subclass expressions in Javascript