Implementation of the n-gram algorithm using JavaScript

ngrams.js

function ngrams(array, length) {
    var ngramsArray = [];

    for (var i = 0; i < array.length - (length - 1); i++) {
        var subNgramsArray = [];

        for (var j = 0; j < length; j++) {
            subNgramsArray.push(array[i + j])
        }

        ngramsArray.push(subNgramsArray);
    }

    return ngramsArray;
}