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 arrays let arr1 = [ "GFG" , "Geeks" , "Portal" ,
"Geek" , "GFG_1" , "GFG_2" ];
let arr2 = [ "GFG" , "Geeks" , "Geek" ];
// Funtion to check subarray function 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 arrays let arr1 = [ "GFG" , "Geeks" , "Portal" ,
"Geek" , "GFG_1" , "GFG_2" ];
let arr2 = [ "GFG" , "Geeks" , "GeekForGeeks" ];
// Function to check subarrays function 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