How to check whether an array is subset of another array using JavaScript ?
The task is to check whether an array is a subset of another array with the help of JavaScript. Here are a few techniques discussed.
Approach 1:
- This approach checks whether every element of the second array is present in the first array or not.
Example 1: This example uses the approach as discussed above.
<!DOCTYPE HTML><html> <head> <title> check whether an array is subset of another array using JavaScript </title></head> <body style="text-align:center;"> <h1 style="color:green;"> GeeksForGeeks </h1> <p id="GFG_UP" style="font-size: 15px; font-weight: bold;"> </p> <button onclick="GFG_Fun()"> click here </button> <p id="GFG_DOWN" style="color:green; font-size: 20px; font-weight: bold;"> </p> <script> var up = document.getElementById('GFG_UP'); var down = document.getElementById('GFG_DOWN'); var arr1 = ["GFG", "Geeks", "Portal", "Geek", "GFG_1", "GFG_2"]; var arr2 = ["GFG", "Geeks", "Geek"]; up.innerHTML = "Click on the button to check the subset property."+ "<br>Array1-" + arr1 + "<br>Array2-" + arr2; function GFG_Fun() { res = arr2.every(function(val) { return arr1.indexOf(val) >= 0; }); not = ""; if (!res) { not = "not"; } down.innerHTML = "Array_2 is " + not + " the subset of Array_1"; } </script></body> </html> |
Output:
- Before clicking on the button:
- After clicking on the button:
Approach 2:
- This approach declares false if some element of second array is not present in first array.
Example 2: This example uses the approach as discussed above.
<!DOCTYPE HTML><html> <head> <title> check whether an array is subset of another array using JavaScript </title></head> <body style="text-align:center;"> <h1 style="color:green;"> GeeksForGeeks </h1> <p id="GFG_UP" style="font-size: 15px; font-weight: bold;"> </p> <button onclick="GFG_Fun()"> click here </button> <p id="GFG_DOWN" style="color:green; font-size: 20px; font-weight: bold;"> </p> <script> var up = document.getElementById('GFG_UP'); var down = document.getElementById('GFG_DOWN'); var arr1 = ["GFG", "Geeks", "Portal", "Geek", "GFG_1", "GFG_2"]; var arr2 = ["GFG", "Geeks", "GeekForGeeks"]; up.innerHTML = "Click on the button to check the subset property."+ "<br>Array1-" + arr1 + "<br>Array2-" + arr2; function GFG_Fun() { res = !arr2.some(val => arr1.indexOf(val) === -1); not = ""; if (!res) { not = "not"; } down.innerHTML = "Array_2 is " + not + " the subset of Array_1"; } </script></body> </html> |
Output:
- Before clicking on the button:
- After clicking on the button:
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