The task is to check whether an array is a subset of another array with the help of JavaScript. There are a few approaches, we will discuss below:
Approaches:
Approach 1: Using JavaScript array.every() method
This approach checks whether every element of the second array is present in the first array or not.
Example: This example uses the approach discussed above.
Javascript
// Creating 2 arrayslet arr1 = ["GFG", "Geeks", "Portal", "Geek", "GFG_1", "GFG_2"]; let arr2 = ["GFG", "Geeks", "Geek"];// Funtion to check subarrayfunction GFG_Fun() { let res = arr2.every(function (val) { return arr1.indexOf(val) >= 0; }); let not = ""; if (!res) { not = "not"; } // Display the output console.log("Array_2 is " + not + " the subset of Array_1");}GFG_Fun(); |
Output
Array_2 is the subset of Array_1
Approach 2: Using JavaScript array.some() method
This approach declares false if some element of the second array is not present in the first array.
Example: This example uses the approach discussed above.
Javascript
// Create input arrayslet arr1 = ["GFG", "Geeks", "Portal", "Geek", "GFG_1", "GFG_2"];let arr2 = ["GFG", "Geeks", "GeekForGeeks"];// Function to check subarraysfunction GFG_Fun() { let res = !arr2.some(val => arr1.indexOf(val) === -1); let not = ""; if (!res) { not = "not"; } // Display output console.log("Array_2 is " + not + " the subset of Array_1");}GFG_Fun(); |
Output
Array_2 is not the subset of Array_1
