A simple interiew question

Reference Types Interview

var people = [
    { name: 'John Hill', age: 22 },
    { name: 'Jack Chill', age: 27 }
];
 
var getInitials = function( name ) {
    // Reusing the name argument makes little sense in general.
    // We are making this assignment here for demonstrating
    // the difference between value types and reference types.
    name = name.split( ' ' ).map( function( word ) {
        return word.charAt( 0 );
    } ).join( '' );
 
    console.log( name );
 
    return name;
}
 
var increaseAge = function( person ) {
    person.age += 1;
}


// Part 1: getInitials
const inititals = getInitials( people[0].name );
console.log( inititals );
console.log( people[0].name );

// Part 2: increaseAge
increaseAge( people[1] );
console.log( people[1].age );