let array1 = [1,2,'a',3,'b',4,5]
let array2 = [1,2,'a',3,'b',4,5,6,'k']

const checkIfArrayHasNValuesOfSameDataTypeCohesively = datatype => n => array => {
    let _n = 0;
    for (let i = 0; i < array.length; i++) {
        if (typeof array[i] == datatype) {
            if (++_n >= n) return true;
        }
        else {
            _n = 0;
        }
    }
    return false;
}

checkIfArrayHasNValuesOfSameDataTypeCohesively('number')(3)(array1); // false
checkIfArrayHasNValuesOfSameDataTypeCohesively('number')(3)(array2); // true