JavaScriptový program na porovnanie prvkov dvoch polí

V tomto príklade sa naučíte písať program JavaScript, ktorý bude porovnávať prvky dvoch polí.

Aby ste pochopili tento príklad, mali by ste mať znalosti nasledujúcich tém programovania v jazyku JavaScript:

• JavaScript pre slučku
• Pole JavaScript
• Funkcia JavaScript a výrazy funkcií

Príklad 1: Porovnanie polí pomocou 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);

Výkon

 Polia majú rovnaké prvky.

JSON.stringify()Metóda prevedie poľa do JSON reťazca.

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

Potom sa dva reťazce poľa porovnajú pomocou ==.

Príklad 2: Porovnanie polí pomocou slučky 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.

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