javascript - Compare 2 arrays and show unmatched elements from array 1 -


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i have 2 arrays follows. want compare both arrays , provide elements 'check' not present in 'data' array. 

var check= ["044", "451"], data = ["343", "333", "044", "123", "444", "555"];

the function used follows. function result in providing elements in 'check' array present in 'data' array

function getmatch(a, b) { var matches = [];  ( var = 0; < a.length; i++ ) {     ( var e = 0; e < b.length; e++ ) {         if ( a[i] === b[e] ) matches.push( a[i] );     } } return matches; }  getmatch(check, data); // ["044"] ---> answer '044' present in 'data'

i want have list of elements not present in 'data' array. can let me know how achieve this.

you use filter , set, providing set context filter method, can accessed this:

var check= ["044", "451"],  data = ["343", "333", "044", "123", "444", "555"];    var res = check.filter( function(n) { return !this.has(n) }, new set(data) );    console.log(res);

note runs in o(n) time, contrary indexof/includes based solutions, represent nested loop.


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