JavaScript: Check whether two arrays of integers of same length are similar or not

JavaScript Basic: Exercise-87 with Solution

Write a JavaScript program to determine if two arrays of integers of the same length are similar. The arrays will be similar if one array can be obtained from another array by swapping at most one pair of elements.

Visual Presentation:

Sample Solution:

JavaScript Code:

// Function to check if rearranging elements of one array can make it equal to another array
function array_checking(arra1, arra2) {
  // Iterate through elements of arra1
  for (var i = 0; i < arra1.length; i++) {
    // Nested loop to swap elements and check permutations
    for (var j = i; j < arra1.length; j++) {
      // Initialize result and temporary variable
      var result = true,
        temp = arra1[i];

      // Swap elements
      arra1[i] = arra1[j];
      arra1[j] = temp;

      // Compare elements of the modified arra1 with arra2
      for (var k = 0; k < arra1.length; k++) {
        if (arra1[k] !== arra2[k]) {
          result = false;
          break;
        }
      }

      // If the arrays match, return true
      if (result) {
        return true;
      }

      // Restore the original order by swapping back elements
      arra1[j] = arra1[i];
      arra1[i] = temp;
    }
  }

  // If no match is found, return false
  return false;
}

// Example usage
console.log(array_checking([10, 20, 30], [10, 20, 30]));   // true
console.log(array_checking([10, 20, 30], [30, 10, 20]));   // true
console.log(array_checking([10, 20, 30, 40], [10, 30, 20, 40]));   // false

Output:

true
false
true

Live Demo:

See the Pen javascript-basic-exercise-87 by w3resource (@w3resource) on CodePen.

Flowchart:

ES6 Version:

// Function to check if two arrays are equal regardless of the order of elements
const array_checking = (arra1, arra2) => {

  // Loop through the elements of the first array
  for (let i = 0; i < arra1.length; i++) {
    // Nested loop starting from i to compare different combinations of elements
    for (let j = i; j < arra1.length; j++) {
      // Swap elements to create different combinations
      let result = true,
        temp = arra1[i];
      arra1[i] = arra1[j];
      arra1[j] = temp;

      // Check if the current combination is equal to the second array
      for (let k = 0; k < arra1.length; k++) {
        if (arra1[k] !== arra2[k]) {
          result = false;
          break;
        }
      }

      // If the combination matches, return true
      if (result) {
        return true;
      }

      // Swap elements back to their original positions
      arra1[j] = arra1[i];
      arra1[i] = temp;
    }
  }

  // If no matching combination is found, return false
  return false;
};

// Example usage
console.log(array_checking([10, 20, 30], [10, 20, 30]));   // true
console.log(array_checking([10, 20, 30], [30, 10, 20]));   // true
console.log(array_checking([10, 20, 30, 40], [10, 30, 20, 40]));   // false

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