[Solved] TypeError: Cannot read property 'length' of undefined <-error only on LC
dflow
680
TypeScriptFeedback
function lengthOfLongestSubstring(s: string) {
    let tempArr: any[] = [];
    let calculateBiggestLengthArray: any[] = [];
    for (let i = 0; i < s.length; i++) {

        for (let j = i; j < s.length; j++) {

            if (!tempArr.includes(s[j])) {
                tempArr.push(s[j]);
                if (j === s.length - 1) {
                    calculateBiggestLengthArray.push(tempArr);
                    tempArr = []
                }
            } else {
                calculateBiggestLengthArray.push(tempArr)
                tempArr = [];
                break;
            }
        }
    }



       //now calculate first biggest length element
       let tempArrForMaxLength = []
       for (let z = 0; z < calculateBiggestLengthArray.length; z++) {
           tempArrForMaxLength.push(calculateBiggestLengthArray[z].length)
       }
       const index = tempArrForMaxLength.indexOf(Math.max(...tempArrForMaxLength) ?? 0) 
       return calculateBiggestLengthArray[index].length;
        
}

Yes i have checked there is no chance of 'undefined' behavior.

Code works with my own (vscode and typescript playground) code & passes leetcode test cases, but when I submit I get:

Runtime Error Message:
       return calculateBiggestLengthArray[index].length;
                                                 ^
TypeError: Cannot read property 'length' of undefined
    Line 30: Char 50 in solution.ts (lengthOfLongestSubstring)
    Line 42: Char 19 in solution.ts (Object.<anonymous>)
    Line 16: Char 8 in runner.js (Object.runner)
    Line 33: Char 26 in solution.ts (Object.<anonymous>)
    Line 1251: Char 30 in loader.js (Module._compile)
    Line 1272: Char 10 in loader.js (Object.Module._extensions..js)
    Line 1100: Char 32 in loader.js (Module.load)
    Line 962: Char 14 in loader.js (Function.Module._load)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
    Line 17: Char 47 in run_main_module.js
Last executed input:

Here is another example of code that runs on vscode and fails on leetcode with the same type of error:
https://leetcode.com/problems/length-of-last-word/discuss/21885/javascript-runtime-error-message-line-12-typeerror-cannot-read-property-length-of-undefined

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