JSFiddle - React, Tailwind, and code Playground

JavaScript

function a(z){for(i=r='';i++<26;)for(j=i;j--;)r+=String.fromCharCode(i+96);return(z==r)*42}


var test = 'abbcccddddeeeeeffffffggggggghhhhhhhhiiiiiiiiijjjjjjjjjjkkkkkkkkkkkllllllllllllmmmmmmmmmmmmmnnnnnnnnnnnnnnoooooooooooooooppppppppppppppppqqqqqqqqqqqqqqqqqrrrrrrrrrrrrrrrrrrsssssssssssssssssssttttttttttttttttttttuuuuuuuuuuuuuuuuuuuuuvvvvvvvvvvvvvvvvvvvvvvwwwwwwwwwwwwwwwwwwwwwwwxxxxxxxxxxxxxxxxxxxxxxxxyyyyyyyyyyyyyyyyyyyyyyyyyzzzzzzzzzzzzzzzzzzzzzzzzzz';

document.writeln('<pre>');
document.writeln(a('testing'));
document.writeln(a(test));
document.writeln('</pre>');