'use strict';const common = require('../common');const assert = require('assert');
const b = Buffer.from('abcdef');const buf_a = Buffer.from('a');const buf_bc = Buffer.from('bc');const buf_f = Buffer.from('f');const buf_z = Buffer.from('z');const buf_empty = Buffer.from('');
const s = 'abcdef';
assert.strictEqual(b.indexOf('a'), 0);assert.strictEqual(b.indexOf('a', 1), -1);assert.strictEqual(b.indexOf('a', -1), -1);assert.strictEqual(b.indexOf('a', -4), -1);assert.strictEqual(b.indexOf('a', -b.length), 0);assert.strictEqual(b.indexOf('a', NaN), 0);assert.strictEqual(b.indexOf('a', -Infinity), 0);assert.strictEqual(b.indexOf('a', Infinity), -1);assert.strictEqual(b.indexOf('bc'), 1);assert.strictEqual(b.indexOf('bc', 2), -1);assert.strictEqual(b.indexOf('bc', -1), -1);assert.strictEqual(b.indexOf('bc', -3), -1);assert.strictEqual(b.indexOf('bc', -5), 1);assert.strictEqual(b.indexOf('bc', NaN), 1);assert.strictEqual(b.indexOf('bc', -Infinity), 1);assert.strictEqual(b.indexOf('bc', Infinity), -1);assert.strictEqual(b.indexOf('f'), b.length - 1);assert.strictEqual(b.indexOf('z'), -1);assert.strictEqual(b.indexOf(''), 0);assert.strictEqual(b.indexOf('', 1), 1);assert.strictEqual(b.indexOf('', b.length + 1), b.length);assert.strictEqual(b.indexOf('', Infinity), b.length);assert.strictEqual(b.indexOf(buf_a), 0);assert.strictEqual(b.indexOf(buf_a, 1), -1);assert.strictEqual(b.indexOf(buf_a, -1), -1);assert.strictEqual(b.indexOf(buf_a, -4), -1);assert.strictEqual(b.indexOf(buf_a, -b.length), 0);assert.strictEqual(b.indexOf(buf_a, NaN), 0);assert.strictEqual(b.indexOf(buf_a, -Infinity), 0);assert.strictEqual(b.indexOf(buf_a, Infinity), -1);assert.strictEqual(b.indexOf(buf_bc), 1);assert.strictEqual(b.indexOf(buf_bc, 2), -1);assert.strictEqual(b.indexOf(buf_bc, -1), -1);assert.strictEqual(b.indexOf(buf_bc, -3), -1);assert.strictEqual(b.indexOf(buf_bc, -5), 1);assert.strictEqual(b.indexOf(buf_bc, NaN), 1);assert.strictEqual(b.indexOf(buf_bc, -Infinity), 1);assert.strictEqual(b.indexOf(buf_bc, Infinity), -1);assert.strictEqual(b.indexOf(buf_f), b.length - 1);assert.strictEqual(b.indexOf(buf_z), -1);assert.strictEqual(b.indexOf(buf_empty), 0);assert.strictEqual(b.indexOf(buf_empty, 1), 1);assert.strictEqual(b.indexOf(buf_empty, b.length + 1), b.length);assert.strictEqual(b.indexOf(buf_empty, Infinity), b.length);assert.strictEqual(b.indexOf(0x61), 0);assert.strictEqual(b.indexOf(0x61, 1), -1);assert.strictEqual(b.indexOf(0x61, -1), -1);assert.strictEqual(b.indexOf(0x61, -4), -1);assert.strictEqual(b.indexOf(0x61, -b.length), 0);assert.strictEqual(b.indexOf(0x61, NaN), 0);assert.strictEqual(b.indexOf(0x61, -Infinity), 0);assert.strictEqual(b.indexOf(0x61, Infinity), -1);assert.strictEqual(b.indexOf(0x0), -1);
assert.strictEqual(b.indexOf('d', 2), 3);assert.strictEqual(b.indexOf('f', 5), 5);assert.strictEqual(b.indexOf('f', -1), 5);assert.strictEqual(b.indexOf('f', 6), -1);
assert.strictEqual(b.indexOf(Buffer.from('d'), 2), 3);assert.strictEqual(b.indexOf(Buffer.from('f'), 5), 5);assert.strictEqual(b.indexOf(Buffer.from('f'), -1), 5);assert.strictEqual(b.indexOf(Buffer.from('f'), 6), -1);
assert.strictEqual(b.indexOf('b', 'utf8'), 1);assert.strictEqual(b.indexOf('b', 'UTF8'), 1);assert.strictEqual(b.indexOf('62', 'HEX'), 1);assert.throws(() => b.indexOf('bad', 'enc'), /Unknown encoding: enc/);
assert.strictEqual( Buffer.from(b.toString('hex'), 'hex') .indexOf('64', 0, 'hex'), 3);assert.strictEqual( Buffer.from(b.toString('hex'), 'hex') .indexOf(Buffer.from('64', 'hex'), 0, 'hex'), 3);
assert.strictEqual( Buffer.from(b.toString('base64'), 'base64') .indexOf('ZA==', 0, 'base64'), 3);assert.strictEqual( Buffer.from(b.toString('base64'), 'base64') .indexOf(Buffer.from('ZA==', 'base64'), 0, 'base64'), 3);
assert.strictEqual( Buffer.from(b.toString('base64url'), 'base64url') .indexOf('ZA==', 0, 'base64url'), 3);
assert.strictEqual( Buffer.from(b.toString('ascii'), 'ascii') .indexOf('d', 0, 'ascii'), 3);assert.strictEqual( Buffer.from(b.toString('ascii'), 'ascii') .indexOf(Buffer.from('d', 'ascii'), 0, 'ascii'), 3);
assert.strictEqual( Buffer.from(b.toString('latin1'), 'latin1') .indexOf('d', 0, 'latin1'), 3);assert.strictEqual( Buffer.from(b.toString('latin1'), 'latin1') .indexOf(Buffer.from('d', 'latin1'), 0, 'latin1'), 3);assert.strictEqual( Buffer.from('aa\u00e8aa', 'latin1') .indexOf('\u00e8', 'latin1'), 2);assert.strictEqual( Buffer.from('\u00e8', 'latin1') .indexOf('\u00e8', 'latin1'), 0);assert.strictEqual( Buffer.from('\u00e8', 'latin1') .indexOf(Buffer.from('\u00e8', 'latin1'), 'latin1'), 0);
assert.strictEqual( Buffer.from(b.toString('binary'), 'binary') .indexOf('d', 0, 'binary'), 3);assert.strictEqual( Buffer.from(b.toString('binary'), 'binary') .indexOf(Buffer.from('d', 'binary'), 0, 'binary'), 3);assert.strictEqual( Buffer.from('aa\u00e8aa', 'binary') .indexOf('\u00e8', 'binary'), 2);assert.strictEqual( Buffer.from('\u00e8', 'binary') .indexOf('\u00e8', 'binary'), 0);assert.strictEqual( Buffer.from('\u00e8', 'binary') .indexOf(Buffer.from('\u00e8', 'binary'), 'binary'), 0);
assert.strictEqual(Buffer.from('aaaa0').indexOf('30', 'hex'), 4);assert.strictEqual(Buffer.from('aaaa00a').indexOf('3030', 'hex'), 4);
{ ['ucs2', 'utf16le'].forEach((encoding) => { const twoByteString = Buffer.from( '\u039a\u0391\u03a3\u03a3\u0395', encoding);
assert.strictEqual(twoByteString.indexOf('\u0395', 4, encoding), 8); assert.strictEqual(twoByteString.indexOf('\u03a3', -4, encoding), 6); assert.strictEqual(twoByteString.indexOf('\u03a3', -6, encoding), 4); assert.strictEqual(twoByteString.indexOf( Buffer.from('\u03a3', encoding), -6, encoding), 4); assert.strictEqual(-1, twoByteString.indexOf('\u03a3', -2, encoding)); });}
const mixedByteStringUcs2 = Buffer.from('\u039a\u0391abc\u03a3\u03a3\u0395', 'ucs2');assert.strictEqual(mixedByteStringUcs2.indexOf('bc', 0, 'ucs2'), 6);assert.strictEqual(mixedByteStringUcs2.indexOf('\u03a3', 0, 'ucs2'), 10);assert.strictEqual(-1, mixedByteStringUcs2.indexOf('\u0396', 0, 'ucs2'));
assert.strictEqual( mixedByteStringUcs2.indexOf(Buffer.from('bc', 'ucs2'), 0, 'ucs2'), 6);assert.strictEqual( mixedByteStringUcs2.indexOf(Buffer.from('\u03a3', 'ucs2'), 0, 'ucs2'), 10);assert.strictEqual( -1, mixedByteStringUcs2.indexOf(Buffer.from('\u0396', 'ucs2'), 0, 'ucs2'));
{ const twoByteString = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'ucs2');
assert.strictEqual(twoByteString.indexOf('\u039a', 0, 'ucs2'), 0); let index = twoByteString.indexOf('\u0391', 0, 'ucs2'); assert.strictEqual(index, 2, `Alpha - at index ${index}`); index = twoByteString.indexOf('\u03a3', 0, 'ucs2'); assert.strictEqual(index, 4, `First Sigma - at index ${index}`); index = twoByteString.indexOf('\u03a3', 6, 'ucs2'); assert.strictEqual(index, 6, `Second Sigma - at index ${index}`); index = twoByteString.indexOf('\u0395', 0, 'ucs2'); assert.strictEqual(index, 8, `Epsilon - at index ${index}`); index = twoByteString.indexOf('\u0392', 0, 'ucs2'); assert.strictEqual(-1, index, `Not beta - at index ${index}`);
index = twoByteString.indexOf('\u039a\u0391', 0, 'ucs2'); assert.strictEqual(index, 0, `Lambda Alpha - at index ${index}`); index = twoByteString.indexOf('\u0391\u03a3', 0, 'ucs2'); assert.strictEqual(index, 2, `Alpha Sigma - at index ${index}`); index = twoByteString.indexOf('\u03a3\u03a3', 0, 'ucs2'); assert.strictEqual(index, 4, `Sigma Sigma - at index ${index}`); index = twoByteString.indexOf('\u03a3\u0395', 0, 'ucs2'); assert.strictEqual(index, 6, `Sigma Epsilon - at index ${index}`);}
const mixedByteStringUtf8 = Buffer.from('\u039a\u0391abc\u03a3\u03a3\u0395');assert.strictEqual(mixedByteStringUtf8.indexOf('bc'), 5);assert.strictEqual(mixedByteStringUtf8.indexOf('bc', 5), 5);assert.strictEqual(mixedByteStringUtf8.indexOf('bc', -8), 5);assert.strictEqual(mixedByteStringUtf8.indexOf('\u03a3'), 7);assert.strictEqual(mixedByteStringUtf8.indexOf('\u0396'), -1);
let longString = 'A';for (let i = 66; i < 76; i++) { longString = longString + String.fromCharCode(i) + longString;}
const longBufferString = Buffer.from(longString);
let pattern = 'ABACABADABACABA';for (let i = 0; i < longBufferString.length - pattern.length; i += 7) { const index = longBufferString.indexOf(pattern, i); assert.strictEqual((i + 15) & ~0xf, index, `Long ABACABA...-string at index ${i}`);}
let index = longBufferString.indexOf('AJABACA');assert.strictEqual(index, 510, `Long AJABACA, First J - at index ${index}`);index = longBufferString.indexOf('AJABACA', 511);assert.strictEqual(index, 1534, `Long AJABACA, Second J - at index ${index}`);
pattern = 'JABACABADABACABA';index = longBufferString.indexOf(pattern);assert.strictEqual(index, 511, `Long JABACABA..., First J - at index ${index}`);index = longBufferString.indexOf(pattern, 512);assert.strictEqual( index, 1535, `Long JABACABA..., Second J - at index ${index}`);
const asciiString = Buffer.from( 'arglebargleglopglyfarglebargleglopglyfarglebargleglopglyf');assert.strictEqual(-1, asciiString.indexOf('\x2061'));assert.strictEqual(asciiString.indexOf('leb', 0), 3);
const allCodePoints = [];for (let i = 0; i < 65534; i++) allCodePoints[i] = i;const allCharsString = String.fromCharCode.apply(String, allCodePoints) + String.fromCharCode(65534, 65535);const allCharsBufferUtf8 = Buffer.from(allCharsString);const allCharsBufferUcs2 = Buffer.from(allCharsString, 'ucs2');
assert.strictEqual(-1, allCharsBufferUtf8.indexOf('notfound'));assert.strictEqual(-1, allCharsBufferUcs2.indexOf('notfound'));
assert.strictEqual(Buffer.from('aaaa').indexOf('a'.repeat(4), 'ucs2'), -1);
assert.strictEqual(Buffer.from('aaaa').indexOf('a'.repeat(4), 'utf8'), 0);assert.strictEqual(Buffer.from('aaaa').indexOf('你好', 'ucs2'), -1);
assert.strictEqual(Buffer.from('aaaaa').indexOf('b', 'ucs2'), -1);
{ const lengths = [1, 3, 15]; const indices = [0x5, 0x60, 0x400, 0x680, 0x7ee, 0xFF02, 0x16610, 0x2f77b]; for (let lengthIndex = 0; lengthIndex < lengths.length; lengthIndex++) { for (let i = 0; i < indices.length; i++) { const index = indices[i]; let length = lengths[lengthIndex];
if (index + length > 0x7F) { length = 2 * length; }
if (index + length > 0x7FF) { length = 3 * length; }
if (index + length > 0xFFFF) { length = 4 * length; }
const patternBufferUtf8 = allCharsBufferUtf8.slice(index, index + length); assert.strictEqual(index, allCharsBufferUtf8.indexOf(patternBufferUtf8));
const patternStringUtf8 = patternBufferUtf8.toString(); assert.strictEqual(index, allCharsBufferUtf8.indexOf(patternStringUtf8)); } }}
[ () => {}, {}, [],].forEach((val) => { assert.throws( () => b.indexOf(val), { code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError', message: 'The "value" argument must be one of type number or string ' + 'or an instance of Buffer or Uint8Array.' + common.invalidArgTypeHelper(val) } );});
assert.strictEqual(b.indexOf('b', undefined), 1);assert.strictEqual(b.indexOf('b', {}), 1);assert.strictEqual(b.indexOf('b', 0), 1);assert.strictEqual(b.indexOf('b', null), 1);assert.strictEqual(b.indexOf('b', []), 1);
assert.strictEqual(b.indexOf('b', [2]), -1);
assert.strictEqual( b.indexOf('b', undefined), s.indexOf('b', undefined));assert.strictEqual( b.indexOf('b', {}), s.indexOf('b', {}));assert.strictEqual( b.indexOf('b', 0), s.indexOf('b', 0));assert.strictEqual( b.indexOf('b', null), s.indexOf('b', null));assert.strictEqual( b.indexOf('b', []), s.indexOf('b', []));assert.strictEqual( b.indexOf('b', [2]), s.indexOf('b', [2]));
assert.strictEqual(b.lastIndexOf('a'), 0);assert.strictEqual(b.lastIndexOf('a', 1), 0);assert.strictEqual(b.lastIndexOf('b', 1), 1);assert.strictEqual(b.lastIndexOf('c', 1), -1);assert.strictEqual(b.lastIndexOf('a', -1), 0);assert.strictEqual(b.lastIndexOf('a', -4), 0);assert.strictEqual(b.lastIndexOf('a', -b.length), 0);assert.strictEqual(b.lastIndexOf('a', -b.length - 1), -1);assert.strictEqual(b.lastIndexOf('a', NaN), 0);assert.strictEqual(b.lastIndexOf('a', -Infinity), -1);assert.strictEqual(b.lastIndexOf('a', Infinity), 0);assert.strictEqual(b.lastIndexOf(buf_a), 0);assert.strictEqual(b.lastIndexOf(buf_a, 1), 0);assert.strictEqual(b.lastIndexOf(buf_a, -1), 0);assert.strictEqual(b.lastIndexOf(buf_a, -4), 0);assert.strictEqual(b.lastIndexOf(buf_a, -b.length), 0);assert.strictEqual(b.lastIndexOf(buf_a, -b.length - 1), -1);assert.strictEqual(b.lastIndexOf(buf_a, NaN), 0);assert.strictEqual(b.lastIndexOf(buf_a, -Infinity), -1);assert.strictEqual(b.lastIndexOf(buf_a, Infinity), 0);assert.strictEqual(b.lastIndexOf(buf_bc), 1);assert.strictEqual(b.lastIndexOf(buf_bc, 2), 1);assert.strictEqual(b.lastIndexOf(buf_bc, -1), 1);assert.strictEqual(b.lastIndexOf(buf_bc, -3), 1);assert.strictEqual(b.lastIndexOf(buf_bc, -5), 1);assert.strictEqual(b.lastIndexOf(buf_bc, -6), -1);assert.strictEqual(b.lastIndexOf(buf_bc, NaN), 1);assert.strictEqual(b.lastIndexOf(buf_bc, -Infinity), -1);assert.strictEqual(b.lastIndexOf(buf_bc, Infinity), 1);assert.strictEqual(b.lastIndexOf(buf_f), b.length - 1);assert.strictEqual(b.lastIndexOf(buf_z), -1);assert.strictEqual(b.lastIndexOf(buf_empty), b.length);assert.strictEqual(b.lastIndexOf(buf_empty, 1), 1);assert.strictEqual(b.lastIndexOf(buf_empty, b.length + 1), b.length);assert.strictEqual(b.lastIndexOf(buf_empty, Infinity), b.length);assert.strictEqual(b.lastIndexOf(0x61), 0);assert.strictEqual(b.lastIndexOf(0x61, 1), 0);assert.strictEqual(b.lastIndexOf(0x61, -1), 0);assert.strictEqual(b.lastIndexOf(0x61, -4), 0);assert.strictEqual(b.lastIndexOf(0x61, -b.length), 0);assert.strictEqual(b.lastIndexOf(0x61, -b.length - 1), -1);assert.strictEqual(b.lastIndexOf(0x61, NaN), 0);assert.strictEqual(b.lastIndexOf(0x61, -Infinity), -1);assert.strictEqual(b.lastIndexOf(0x61, Infinity), 0);assert.strictEqual(b.lastIndexOf(0x0), -1);
assert.strictEqual(b.lastIndexOf('b', undefined), 1);assert.strictEqual(b.lastIndexOf('b', {}), 1);
assert.strictEqual(b.lastIndexOf('b', 0), -1);assert.strictEqual(b.lastIndexOf('b', null), -1);assert.strictEqual(b.lastIndexOf('b', []), -1);
assert.strictEqual(b.lastIndexOf('b', [2]), 1);
assert.strictEqual( b.lastIndexOf('b', undefined), s.lastIndexOf('b', undefined));assert.strictEqual( b.lastIndexOf('b', {}), s.lastIndexOf('b', {}));assert.strictEqual( b.lastIndexOf('b', 0), s.lastIndexOf('b', 0));assert.strictEqual( b.lastIndexOf('b', null), s.lastIndexOf('b', null));assert.strictEqual( b.lastIndexOf('b', []), s.lastIndexOf('b', []));assert.strictEqual( b.lastIndexOf('b', [2]), s.lastIndexOf('b', [2]));
assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'ucs2'), -1);assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'utf8'), -1);assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'latin1'), -1);assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'binary'), -1);assert.strictEqual(b.lastIndexOf(Buffer.from('aaaaaaaaaaaaaaa')), -1);assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 2, 'ucs2'), -1);assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 3, 'utf8'), -1);assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 5, 'latin1'), -1);assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 5, 'binary'), -1);assert.strictEqual(b.lastIndexOf(Buffer.from('aaaaaaaaaaaaaaa'), 7), -1);
assert.strictEqual(buf_bc.lastIndexOf('你好', 'ucs2'), -1);assert.strictEqual(buf_bc.lastIndexOf('你好', 'utf8'), -1);assert.strictEqual(buf_bc.lastIndexOf('你好', 'latin1'), -1);assert.strictEqual(buf_bc.lastIndexOf('你好', 'binary'), -1);assert.strictEqual(buf_bc.lastIndexOf(Buffer.from('你好')), -1);assert.strictEqual(buf_bc.lastIndexOf('你好', 2, 'ucs2'), -1);assert.strictEqual(buf_bc.lastIndexOf('你好', 3, 'utf8'), -1);assert.strictEqual(buf_bc.lastIndexOf('你好', 5, 'latin1'), -1);assert.strictEqual(buf_bc.lastIndexOf('你好', 5, 'binary'), -1);assert.strictEqual(buf_bc.lastIndexOf(Buffer.from('你好'), 7), -1);
const bufferString = Buffer.from('a man a plan a canal panama');assert.strictEqual(bufferString.lastIndexOf('canal'), 15);assert.strictEqual(bufferString.lastIndexOf('panama'), 21);assert.strictEqual(bufferString.lastIndexOf('a man a plan a canal panama'), 0);assert.strictEqual(-1, bufferString.lastIndexOf('a man a plan a canal mexico'));assert.strictEqual(-1, bufferString .lastIndexOf('a man a plan a canal mexico city'));assert.strictEqual(-1, bufferString.lastIndexOf(Buffer.from('a'.repeat(1000))));assert.strictEqual(bufferString.lastIndexOf('a man a plan', 4), 0);assert.strictEqual(bufferString.lastIndexOf('a '), 13);assert.strictEqual(bufferString.lastIndexOf('a ', 13), 13);assert.strictEqual(bufferString.lastIndexOf('a ', 12), 6);assert.strictEqual(bufferString.lastIndexOf('a ', 5), 0);assert.strictEqual(bufferString.lastIndexOf('a ', -1), 13);assert.strictEqual(bufferString.lastIndexOf('a ', -27), 0);assert.strictEqual(-1, bufferString.lastIndexOf('a ', -28));
const abInUCS2 = Buffer.from('ab', 'ucs2');assert.strictEqual(-1, Buffer.from('µaaaa¶bbbb', 'latin1').lastIndexOf('µ'));assert.strictEqual(-1, Buffer.from('µaaaa¶bbbb', 'binary').lastIndexOf('µ'));assert.strictEqual(-1, Buffer.from('bc').lastIndexOf('ab'));assert.strictEqual(-1, Buffer.from('abc').lastIndexOf('qa'));assert.strictEqual(-1, Buffer.from('abcdef').lastIndexOf('qabc'));assert.strictEqual(-1, Buffer.from('bc').lastIndexOf(Buffer.from('ab')));assert.strictEqual(-1, Buffer.from('bc', 'ucs2').lastIndexOf('ab', 'ucs2'));assert.strictEqual(-1, Buffer.from('bc', 'ucs2').lastIndexOf(abInUCS2));
assert.strictEqual(Buffer.from('abc').lastIndexOf('ab'), 0);assert.strictEqual(Buffer.from('abc').lastIndexOf('ab', 1), 0);assert.strictEqual(Buffer.from('abc').lastIndexOf('ab', 2), 0);assert.strictEqual(Buffer.from('abc').lastIndexOf('ab', 3), 0);
pattern = 'JABACABADABACABA';assert.strictEqual(longBufferString.lastIndexOf(pattern), 1535);assert.strictEqual(longBufferString.lastIndexOf(pattern, 1535), 1535);assert.strictEqual(longBufferString.lastIndexOf(pattern, 1534), 511);
function countBits(n) { let count; for (count = 0; n > 0; count++) { n = n & (n - 1); } return count;}const parts = [];for (let i = 0; i < 1000000; i++) { parts.push((countBits(i) % 2 === 0) ? 'yolo' : 'swag');}const reallyLong = Buffer.from(parts.join(' '));assert.strictEqual(reallyLong.slice(0, 19).toString(), 'yolo swag swag yolo');
pattern = reallyLong.slice(0, 100000); assert.strictEqual(reallyLong.lastIndexOf(pattern), 4751360);assert.strictEqual(reallyLong.lastIndexOf(pattern, 4000000), 3932160);assert.strictEqual(reallyLong.lastIndexOf(pattern, 3000000), 2949120);pattern = reallyLong.slice(100000, 200000); assert.strictEqual(reallyLong.lastIndexOf(pattern), 4728480);pattern = reallyLong.slice(0, 1000000); assert.strictEqual(reallyLong.lastIndexOf(pattern), 3932160);pattern = reallyLong.slice(0, 2000000); assert.strictEqual(reallyLong.lastIndexOf(pattern), 0);
{ const needle = new Uint8Array([ 0x66, 0x6f, 0x6f ]); const haystack = Buffer.from('a foo b foo'); assert.strictEqual(haystack.indexOf(needle), 2); assert.strictEqual(haystack.lastIndexOf(needle), haystack.length - 3);}
{ assert.throws(() => { const buffer = require('buffer'); new buffer.Buffer.prototype.lastIndexOf(1, 'str'); }, { code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError', message: 'The "buffer" argument must be an instance of Buffer, ' + 'TypedArray, or DataView. ' + 'Received an instance of lastIndexOf' });}