Substring Count

function countSubstringOccur(array) {


    var keywordLength = array[0].length;
    var textLength = array[1].length;
    var keyword = array[0];
    var text = array[1];
    var firstSymbol = keyword[0];
    var counter = 0;

    for (var i = 0; i < textLength; i++) {

        if (text[i] === firstSymbol) {
            var count = 0;
            for (var j = i; j < keywordLength; j++) {

                if (keyword[j - i] === text[j]) {
                    count++;
                    if (count === keywordLength) {
                        counter++;
                    }
                }

            }

        }

    }
    return counter;
}
console.log(countSubstringOccur(["in", "We are living in a yellow submarine. We don't have anything else. Inside the submarine is very tight. So we are drinking all the day. We will move out of it in 5 days."]));