Question

How to check if two halves of a number are equal in JavaScript

Answer 1

function halvesEqual(n) {
    const s = String(n);
    const len = s.length;

    if (len % 2 !== 0) {
        return false; // cannot split evenly
    }

    const half = len / 2;
    const left = s.slice(0, half);
    const right = s.slice(half);

    return left === right;
}

function main() {
    const testNumbers = [1212, 123123, 45454545, 123, 1213];

    for (const n of testNumbers) {
        console.log(`${n} -> ${halvesEqual(n) ? "equal halves" : "not equal"}`);
    }
}

main();



/*
run:

1212 -> equal halves
123123 -> equal halves
45454545 -> equal halves
123 -> not equal
1213 -> not equal

*/

 

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