Programa JavaScript para comparar elementos de duas matrizes

Neste exemplo, você aprenderá a escrever um programa JavaScript que comparará os elementos de dois arrays.

Para entender este exemplo, você deve ter conhecimento dos seguintes tópicos de programação JavaScript:

  • JavaScript para loop
  • Array JavaScript
  • Função JavaScript e expressões de função

Exemplo 1: comparar matrizes usando JSON.stringify ()

 // program to compare two arrays function compareArrays(arr1, arr2) ( // compare arrays const result = JSON.stringify(arr1) == JSON.stringify(arr2) // if result is true if(result) ( console.log('The arrays have the same elements.'); ) else ( console.log('The arrays have different elements.'); ) ) const array1 = (1, 3, 5, 8); const array2 = (1, 3, 5, 8); compareArrays(array1, array2);

Resultado

 As matrizes possuem os mesmos elementos.

O JSON.stringify()método converte uma matriz em string JSON.

 JSON.stringify((1, 3, 5, 8)); // "(1,3,5,8)"

Em seguida, as duas strings do array são comparadas usando ==.

Exemplo 2: comparar matrizes usando for Loop

 // program to extract value as an array from an array of objects function compareArrays(arr1, arr2) ( // check the length if(arr1.length != arr2.length) ( return false; ) else ( let result = false; // comparing each element of array for(let i=0; i 

Output

 The arrays have the same elements.

In the above program,

The length of the array elements are compared using the length property. If both arrays have different lengths, false is returned.

Else,

  • The for loop is used to iterate through all the elements of the first array.
  • During each iteration, elements of the first array are compared to corresponding elements of the second array.
     arr1(i) != arr2(i)
  • If the corresponding array elements of both arrays are not equal, false is returned and the loop terminates.
  • If all elements are equal, true is returned.

Note: The above program does not work if the array element contains objects.

For example,

 array1 = (1, (a : 2), 3, 5);

Artigos interessantes...