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Questions tagged [lastindexof]

125 questions
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How to return undefined instead of -1, findLastIndex()

In this challenge, I need to return the index position of the last element that is true for a callback. I know findLastIndex returns the last index position, however I need to return 'undefined' instead of -1 if the callback doesn't result in true.…
Joe M
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z3 LastIndexOf returns wrong result?

z3py's LastIndexOf is supposed to return the "last index of substring within a string". However, it seems to return the wrong results when the substring is located at the end of the string, for example: >>> import z3 >>> def check_lastindexof(s,…
hemx
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Trying to find the index of the last uppercase char using regex

I need a little bit of help trying to find the last index of the last uppercase char in the string. I have been using regex to do so. However it keeps returning -1 instead of the index of B which is 7. The code is highlighted below public class Main…
DAVE
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Get multiple substring between two characters javascript

I'm taking this post as reference where they suggest this solution: Current Str = 'MyLongString:StringIWant;' Desired Output newStr = 'StringIWant' Solution var mySubString = str.substring( str.lastIndexOf(":") + 1, …
Christopher Martinez
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Is C# string.LastIndexOf always culture specific?

x is a string in any language/culture and want to find the last dot in the string: int y = x.LastIndexOf("."); Is the result (y) culture independent or not? Why?
rodins
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Getting last index of arraylist with condition

I have list as shown below, as this includes many repeated field values of AbcConSch List asBeanList= tbCondition.getAbcConScheds(); AbcConSch abcSchedule = asBeanList.get(i); this list has bag which has elements of data, so i need to…
Arun Kumar A
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Java - Get substring from 2nd last occurrence of a character in string

My input: "professions/medical/doctor/" My desired output: "doctor" I have the following solution but it is not a one-liner: String v = "professions/medical/doctor/"; String v1 = v.substring(0, v.length() - 1); String v2 =…
activelearner
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How do I write a live search function for my dynamically generated table?

I have a script that generates a dynamic table from values stored in an array. I would like to write a live search function searchByNumber(). How do I write a live search function based on values in the Amount and Time column that would dynamically…
SirBT
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Remove rest of string after the second to last index of

I'm relatively new to JS and pretty confused. I have a URL string: https://a/b/c/d/e/f. These are all dynamic characters and change often (could be https://x/s/g/e/h/d for example) In some cases I want to remove only f, in which I use LastIndexOf.…
Uciebila
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Defining a function lastIndexOf?

I am working on a textbook. This is the question: Define a function lastIndexOf, which, given an array and a value, returns the index of the last time the value occurs in the array. If the value never occurs, the function should return -1. Then…
billygreen
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How to find the last word inside a string which is seperated by " "? C#

Thank you all for the help I have got it working with your help. So I have written some code which extracts the first word within a string. Below is my code. var LongString = "Hello World"; var firstWord = LongString.Substring(0,…
user9710070
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Java- How to find non-alphabetical letters in a string? (Quick way)

In Java, given a string, like "abc@df" where the character '@' could be ANY other non-letter, like '%', '^', '&', etc. What would be the most efficient way to find that index? I know that a for loop would be kind of quick (depending on the string…
Jsbbvk
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Java lastIndexOf always return -1 if the character is space and fromIndex is set

Test Code public class HelloWorld{ public static void main(String []args){ System.out.println("Hello World".lastIndexOf(' ')); System.out.println("Hello World".lastIndexOf(' ', 1)); System.out.println("Hello…
Joshua
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Why is C#'s LastIndexOf behave this way?

I have the following code: string s = "Hello, World!"; Console.WriteLine(s.LastIndexOf("World"));//7 Console.WriteLine(s.LastIndexOf("World", 7));//-1 Why the result of the second call to LastIndexOf is -1 and not 7?
User0123456789
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Java URLResource, LastIndexOf,IndexOf,substring method code explanation?

Can someone please help me understand this bit of code with an example. I have been struggling just to get my head around this code. URLResource file = new URLResource("http://www.dukelearntoprogram.com/course2/data/manylinks.html"); for…
rrene
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