Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

JavaScript

function digitosIguais2(sequencia){
	sequencia = sequencia.toString();

	for (i = 0; i < sequencia.length - 1; i++)
		if (sequencia.charAt(i) != sequencia.charAt(i + 1))
			return false;

	return true;
}
alert(digitosIguais2(123)); // falso
alert(digitosIguais2(666)); // verdadeiro

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