Function joinUrlParts

packages/angular/ssr/src/utils/url.ts:97–124

(...parts: string[])

 * ```
 */
export function joinUrlParts(...parts: string[]): string {
  const normalizedParts: string[] = [];

  for (const part of parts) {
    if (part === '') {
      // Skip any empty parts
      continue;
    }

    let start = 0;
    let end = part.length;

    // Use "Pointers" to avoid intermediate slices
    while (start < end && part[start] === '/') {
      start++;
    }

    while (end > start && part[end - 1] === '/') {
      end--;
    }

    if (start < end) {
      normalizedParts.push(part.slice(start, end));
    }
  }

  return addLeadingSlash(normalizedParts.join('/'));
}

/**
 * Strips `/index.html` from the end of a URL's path, if present.