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[英]My code doesn't work within a $(document).ready() function. Can anyone help me understand why?
[英]Can anyone help me understand why im getting this runtime error with my leetcode problem? Longest Prefix
我正在為即將到來的面試練習 Leetcode 問題,我正在做最長前綴問題,當我使用預設運行代碼時,我通過了每個測試,但是當我提交代碼以通過時,我收到運行時錯誤。 這是我在下面寫的代碼。
/**
* @param {string[]} strs
* @return {string}
*/
var longestCommonPrefix = function(strs) {
let splitWords = [];
let commonPrefix =[];
strs.forEach((word,i) =>{
splitWords[i] = word.split('');
})
if( splitWords !== undefined || splitWords.length > 0){
for(i=0; i < splitWords[0].length; i ++){
if(splitWords[0][i] == splitWords[1][i] && splitWords[0][i] == splitWords[2][i]){
commonPrefix.push(splitWords[0][i])
console.log(commonPrefix)
}else{
break;
}
}
}
return (commonPrefix === undefined || commonPrefix.length == 0 ? commonPrefix = "" : commonPrefix.join(''))
};
這是我提交時遇到的錯誤:
Line 12 in solution.js
for(i=0; i < splitWords[0].length; i ++){
^
TypeError: Cannot read property 'length' of undefined
Line 12: Char 32 in solution.js (longestCommonPrefix)
Line 33: Char 19 in solution.js (Object.<anonymous>)
Line 16: Char 8 in runner.js (Object.runner)
Line 24: Char 26 in solution.js (Object.<anonymous>)
Line 1200: Char 30 in loader.js (Module._compile)
Line 1220: Char 10 in loader.js (Object.Module._extensions..js)
Line 1049: Char 32 in loader.js (Module.load)
Line 937: Char 14 in loader.js (Function.Module._load)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
Line 17: Char 47 in run_main_module.js
當我用測試運行它時,它再次工作/通過,當我提交它時,代碼失敗。 我不確定算法也試圖輸入什么輸入,但我認為它是一個空數組?
我知道我可以只查找答案,但我試圖在不查找的情況下完全解決問題。
//"上次執行的輸入[]"
如果查看 Leetcode 問題的約束,可以看到strs
數組中存在空字符串的可能性。
0 <= strs[i].length <= 200
例如,您可以Input: strs = ["","flow","flight"]
。
通過遍歷strs
數組的方式,拆分每個字符串並將它們添加到splitWords
數組將導致以下結果:
0: []
1: (5) ["f", "l", "o", "w"]
2: (5) ["f", "l", "i", "g", "h", "t"]
不檢查空字符串將導致您的 for 循環嘗試訪問未定義的空數組的第一個值的length
。
[]
, splitWords
初始值是[]
,splitWords !== undefined
為真,splitWords[0].length
意思是([])[0].length
,顯然([])[0]
是未定義的。
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