String.prototype.indexOf vs Uint8Array.prototype.indexOf

indexof_bench.js

const string = ` ${'This is just some example big file with lots of strings\n'.repeat ( 100_000 )}`.slice ( 1 );
const uint8 = new TextEncoder ().encode ( string );

const getRangesFromString = value => {

  let pos = 0;
  let length = value.length;

  while ( pos < length ) {
    const startIndex = value.indexOf ( '\n', pos );
    if ( startIndex === -1 ) break;
    pos = startIndex + 1;
  }

};

const getRangesFromUint8 = value => {

  let pos = 0;
  let length = value.length;

  while ( pos < length ) {
    const startIndex = value.indexOf ( 10, pos ); // \n
    if ( startIndex === -1 ) break;
    pos = startIndex + 1;
  }

};

console.log ( 'string length', string.length );
console.log ( 'uint8 length', uint8.length );

console.time ( 'uint8' );
for ( let i = 0; i < 500; i++ ) {
  getRangesFromUint8 ( uint8 );
}
console.timeEnd ( 'uint8' );

console.time ( 'string' );
for ( let i = 0; i < 500; i++ ) {
  getRangesFromString ( string );
}
console.timeEnd ( 'string' );