hair = ["hair"]
hairai = ["hai", "rai"]
hatred = ["hat", "red"]

father = ["fat", "her"]
kid = ["kid"]
lady = ["la","dy"]

const input = "abc";
for (var i in input) {
    console.log(i + " " + typeof(i));
}

0 string
1 string
2 string
formatUnicorn string
truncate string
splitOnLast string
contains string

const input = "abc";
for (let i = 0; i < input.length; i++) {
    console.log(i + " " + typeof(i));
}

0 number
1 number
2 number

var st = '';