Question

How to check if a string contains identical digits in JavaScript

Answer 1

function isStringContainIdenticalDigits(str) {
    const arr = [...str];
    const st = new Set(arr);

    return st.size == 1;
}

let str = "8888888";
console.log(isStringContainIdenticalDigits(str) ? "yes" : "no");

str = "18888888";
console.log(isStringContainIdenticalDigits(str) ? "yes" : "no");



/*
run:

yes
no

*/

 

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