xyz = [{category: "Desktop product", options: ['a']},
 {category: "Cloud service", options:['b']},
 ]

 abc = [{category: "Desktop product", options: ['x']},
 {category: "Cloud product", options: ['c']}]

result = [{category: "Desktop product", options: ['a','x']},
 {category: "Cloud service", options:['b']},
 {category: "Cloud product", options: ['c']}]

I tried :
abc
        .filter(d => categoryList.includes(d.usageCategory))
        .concat(xyz);

but it doesnt work