JSFiddle - React, Tailwind, and code Playground

JavaScript

friends = [];

friends.push(
    {
        a: 'Nexus',
        b: 'Muffin'
    },
    {
        a: 'Turkey',
        b: 'MonkMyster'
    }
    )

console.log(friends);

for(i in friends){
    if(friends[i].a == 'Nexus'){
          delete friends[i];
        friends.push({
            a: 'test',
            b: 'data'
        });
    }
}

console.log(friends);