May 19, 2009 · function countChar (char: string, search: string): number { let num: number = 0; let str: string = search; let pos: number = str.indexOf(char); while(pos > -1) { str = str.slice(pos + 1); pos = str.indexOf(char); num++; } return num; } // Call the function countChar('x', 'foo x …

Oct 24, 2010 · const countOccurence = (string, char) => { const chars = string.match(new RegExp(char, 'g')).length return chars; }

Apr 3, 2012 · I have an array in jQuery, and I need to count the number of "true" strings in that array, and then make the "numOfTrue" variable equal the number of true strings. So in the below array, there are 2 "true" strings, so numOfTrue would be equal to 2.

May 27, 2024 · Using Array.reduce(), convert the string to an array of characters and accumulate the count of occurrences of the specific character by incrementing the accumulator for each occurrence found during iteration.

Nov 23, 2024 · Spread the string into an array ( […s]) and iterate over it using forEach. Update character counts in the object. The reduce () method stores the result into an object. It’s a more functional programming-oriented approach. Use reduce () to build an object that keeps track of character counts.

Write a function to find the occurrence of a character in a string. Return the number of times ch appears str . For example, if given str = "programming" and ch = 'm' , the number of times 'm' appears in str is 2 .

Dec 5, 2021 · This post will discuss how to count the total number of occurrences of a character in a string with JavaScript. 1. Using Regex. Regular expressions are often used in JavaScript for matching a text with a pattern. The following code example demonstrates its usage to get the count of the characters in the string.

Nov 27, 2024 · Here are the various methods to count string occurrence in a string using JavaScript. 1. Using match () Method (Common Approach) The match () method is a simple and effective way to count occurrences using a regular expression. It returns an array of all matches, and the length of the array gives the count.

Feb 2, 2024 · Count Occurrences in the String Using match() in JavaScript. The match() method is an in-built JavaScript method. This method retrieves the result of matching a string/character against a regular expression provided from the original string. Syntax:

Nov 6, 2013 · Do you mean you want to count how many times any item from your array appears in the string? Forget about using regex and just use a simple indexOf to check for number of occurances. This function will help you: var count = 0; var index = str.indexOf(find); while (index != -1) { count++; index = str.indexOf(find, index + 1); return count;