Count instances of string in an array

Using a basic, old-fashioned loop:

var numOfTrue = 0;
for(var i=0;i<Answers.length;i++){
    if(Answers[i] === "true")
       numOfTrue++;
}

or, a reduce

var numOfTrue = Answers.reduce((acc,curr) => {
    if(curr === "true")
       acc++;
    return acc;
},0);

or a filter

var numOfTrue = Answers.filter(x => x === "true").length;