sqrt

Gives square root of value.
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bigint.sqrt(x);
// x: a bigint

const bigint = require('extra-bigint');

bigint.sqrt(16n, 2n);
// 4n

bigint.sqrt(15n, 2n);
// 3n

bigint.sqrt(-16n, 2n);
// null

References

• Math.sqrt: MDN web docs
• Integer square root
• Newton's method