typeof can be used for this

if (typeof abc === "number") {
    // number
} else if (typeof abc === "string"){
//string
}

type of can be used for this

if (typeof abc === "number") {
    // number
} else if (typeof abc === "string"){
//string
}

type of can be used for this

if (typeof abc === "number") {
    // number
} else if (typeof abc === "string"){
//string
}

typeof can be used for this

if (typeof abc === "number") {
    // number
} else if (typeof abc === "string"){
//string
}