I was wondering what is the best way to join a few strings in javascript except if they are empty.
Say we have
let s1 = 'X = 1';
let s2 = '';
let s3 = 'Z = 3';
And my end result need to be "X = 1, Z = 3"
let str = [s1,s2,s3].join(',') // will have extra comma
let str = [s1!??' , ' ,s2!??' , ' ,s3].join(' ') //is ugly, and will not work
let str = [u1&&',' ,u2&&',',u3].join('') //close, but no cigar.
But I am sure there must be an elegant way to do this join!
And someone here on stackoverflow will point me in the right direction.
You can use .filter(Boolean) (which is the same as .filter(x => x)) removes all falsy values (null, undefined, empty strings etc...)
Working Demo :
let s1 = 'X = 1';
let s2 = '';
let s3 = 'Z = 3';
let str = [s1,s2,s3].filter(Boolean).join(", ");
console.log(str);You can also achieve the same using the code below.
Filter Boolean eliminates all falsey values like undefined, empty strings, null etc
let str = [u1,u2,u3].filter(Boolean).join(',');