typeerror - type error undefined in javascript -

i learned javascript , here script:

var = new date(); var date = now.getdate(); var month = now.getmonth(); var holidays = [     [8, 3],     [9, 8],     [10, 16],     [11, 7],     [11, 24],     [11, 25],     [11, 26],     [11, 27],     [11, 28],     [11, 29],     [11, 30],     [11, 31],     [0, 1],     [0, 2],     [0, 3],     [0, 4],     [0, 31],     [1, 15],     [1, 18],     [2, 11],     [2, 12],     [2, 13],     [2, 14],     [2, 15],     [2, 29],     [3, 1],     [4, 20],     [5, 26],     [5, 27],     [5, 28] ]; var = 0; while (i <= holidays.length) {     if (check() === true) {         console.log("no school today.");         = 32;     } else if (check() === false) {         if (i < holidays.length) {             i++;         } else {             console.log("we work today.");             i++;         }     } }  function check() {     if (month == holidays[i][0] && date == holidays[i][1]) {         return true;     } else {         return false;     } } 

the purpose make print out "no school today" days in holiday array, otherwise, it'd print out "we work today". whenever run script says

type error holidays[i] undefined

can me this?

at least 1 problem in code

while (i <= holidays.length) { 

the last should holidays.length-1, use:

while (i < holidays.length) {