Is there a good way to accomplish this Javascript?
Basically I want something where the values of the fields are concatenate into a single field with comma between the values. Figure something simple like this
var a
var b
var c
allfieldvalue = a + ","b + ","c
My issue is I need to build condition in order for them to be put into allfieldvalue. So if var a = true, var b = false, and var c = true, then allfieldvalue = a +","c. Keep in mind, there could 20 different var. Hopefully that makes sense.
Put them in an array, then use .filter() and .join() to concatenate the true values.
let a = true;
let b = false;
let c = true;
let all_vars = [a, b, c];
let result = all_vars.filter(e => e).join(',');
console.log(result);In case the goal is a string containing the names of variables that are true, use this approach:
Make the variables into object props...
var a = true;
var b = false;
var c = true;
let object = { a, b, c }; // produces { a: true, b: false, c: true }
Filter that object to exclude false values:
object = Object.fromEntries(
Object.entries(object).filter(([k,v]) => v) // produces { a: true, c: true }
)
Concat the keys:
let string = Object.keys(object).join(','); // produces "a,c"
Demo
var a = true;
var b = false;
var c = true;
let object = { a, b, c };
object = Object.fromEntries(
Object.entries(object).filter(([k,v]) => v)
)
let string = Object.keys(object).join(',');
console.log(string)First, It depends on what's in the variable, if you want a boolean and display it, you could do something like this :
function myFunc(...variables) {
console.log(variables.filter(v => v != false).join(", "));
}
let a = true;
let b = false;
let c = true
console.log(myFunc(a,b,c));