Append text to an attribute rather than replacing it?

Question

I want to append some text to the title attribute of all elements of a certain class.

Answer 1

JQuery has come a ways. There's a version of .attr() that takes a function as the value argument:

$('.theclass').attr('title', (i, value) => `${value || ""}appended text`);

i is the index of the attribute, value is the current value of the attribute... which might not be set, hence the value || "" expression, to avoid converting undefined into the string 'Undefined' uglily.