const members = [
{gender: 'M', name: 'John'},
{gender: 'M', name: 'Tim'},
{gender: 'F', name: 'Jenny'},
{gender: 'F', name: 'Alice'}
]
findTim = (name) => {
 for(let member of members) {
  if(member.name === name && member.gender === 'M') {
return member.name
} 
// shorthand
member = members.find(member => member.gender === 'M' && member.name === 'Tim');