Pre-ES6, the common way to check if a string contains a substring was to use indexOf, which is a string method that return -1 if the string does not contain the substring. If the substring is found, it returns the index of the character that starts the string....
Read this article to learn more about the String.includes() method in JavaScript. String.indexOf() Method The String.indexOf() method returns the index of the first occurrence of the substring. If the string does not contain the given substring, it returns -1. The indexOf() method is ca...
Boolean Does this string contain the given string? contains: function ( string, separator ) { return ( separator ? ( separator + this + separator ).indexOf( separator + string + separator ) : this.indexOf( string ) ) > -1; }, Method String#hash() Hashes the string to return a num...
Assert that the actual string to not contain something (!==) to expected. Parameters NameTypeArgumentDescription expected mixed repeatable One or more expected value. Returns TypeDescription Object The current instance Example test .string('hello boy') .notContains('bye') .exception(functio...
Or we can use third-party libraries like lodash js and underscore js to check if a string contains a substring or not in javascript. These libraries contain so many javascript utility methods that can be used in our daily projects.
Javascript strings work great for holding text in English and other Latin-based languages, but they fall short when it comes to languages in Unicode's astral plane.Consider this Javascript code. What number does len contain?var str = '𤔣'; var len = str.length;If you said 1, you're ...
If you want to find if a string contains another string then you already have a ready made function for that, and it would bestring.includes(). This function returnstruewhen the method finds another substring included in the main one, and returnsfalsewhen the main string does not contain th...
Parse and stringify URL query strings. Latest version: 9.1.2, last published: 13 days ago. Start using query-string in your project by running `npm i query-string`. There are 9460 other projects in the npm registry using query-string.
If the separator is omitted, the returned array will contain the whole string in index [0]. If the separator is "", the returned array will be an array of single characters: Example text.split("") Try it Yourself » Complete String Reference ...
In this example, we have declared two variables called totn_string1 and totn_string2 that contain accent values that appear the same but are different Unicode values. We have then tested for equality on the original string values as well as their normalized values. We have written the output...