JavaScript: Simplify a given absolute path for a file in Unix-style

Last update on May 30 2022 10:02:43 (UTC/GMT +8 hours)

JavaScript Basic: Exercise-142 with Solution

Write a JavaScript program to simplify a given absolute path for a file in Unix-style.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Simplify a given absolute path for a file in Unix-style.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function simplify_path(main_path) {
  var parts = main_path.split('/'),
      new_path = [],
      length = 0;
  for (var i = 0; i < parts.length; i++) {
    var part = parts[i];
    if (part === '.' || part === '' || part === '..') {
      if (part === '..' && length > 0) {
        length--;
      }
      continue;
    }
    new_path[length++] = part;
  }

  if (length === 0) {
    return '/';
  }

  var result = '';
  for (var i = 0; i < length; i++) {
    result +=  '/'+new_path[i] ;
  }

  return result;
}
console.log(simplify_path("/home/var/./www/../html//sql/"));

Sample Output:

/home/var/html/sql

Flowchart:

ES6 Version:

function simplify_path(main_path) {
  const parts = main_path.split('/');
  const new_path = [];
  let length = 0;
  for (var i = 0; i < parts.length; i++) {
    const part = parts[i];
    if (part === '.' || part === '' || part === '..') {
      if (part === '..' && length > 0) {
        length--;
      }
      continue;
    }
    new_path[length++] = part;
  }

  if (length === 0) {
    return '/';
  }

  let result = '';
  for (var i = 0; i < length; i++) {
    result +=  `/${new_path[i]}` ;
  }

  return result;
}
console.log(simplify_path("/home/var/./www/../html//sql/"));

Live Demo:

See the Pen javascript-basic-exercise-142 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04