# bitLength property

int bitLength

Returns the minimum number of bits required to store this big integer.

The number of bits excludes the sign bit, which gives the natural length for non-negative (unsigned) values. Negative values are complemented to return the bit position of the first bit that differs from the sign bit.

To find the number of bits needed to store the value as a signed value, add one, i.e. use `x.bitLength + 1`.

    x.bitLength == (-x-1).bitLength

    new BigInt.from(3).bitLength == 2;   // 00000011
    new BigInt.from(2).bitLength == 2;   // 00000010
    new BigInt.from(1).bitLength == 1;   // 00000001
    new BigInt.from(0).bitLength == 0;   // 00000000
    new BigInt.from(-1).bitLength == 0;  // 11111111
    new BigInt.from(-2).bitLength == 1;  // 11111110
    new BigInt.from(-3).bitLength == 2;  // 11111101
    new BigInt.from(-4).bitLength == 2;  // 11111100

## Implementation

    int get bitLength;