Three words

It's interesting that isFinite doesn't work here (It says :8,18: Argument of type 'string' is not assignable to parameter of type 'number'.): But if we change 'the style of function' from this
'function threeWords(text: string): boolean {'

to this
'function threeWords(text){'

it will work:

 function threeWords(text: string): boolean { //function threeWords(text){
    let arr = text.split(' ');
    let sum = 0;
    console.log(arr[0].match(/[0-9]/) == null)
    for (let i  = 0; i < arr.length; i++) {
        if (isFinite(arr[i]) == false) {
            sum++;
            if (sum == 3) return true;
        } else {
            sum = 0;
        }
    }
     return false;
        }
//console.log(threeWords("Hello World hello"), true);
console.log(threeWords("He is 123 man"), false);