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....
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 case-sensitive and accepts two parameters. The first parameter is the substring to sea...
The first string contains at least one letter whereas the next two don't. TheString.match()method returns an array of the matches for the first string andnullvalues for the next two. If you ever need help reading a regular expression, check out thisregular expression cheat sheetby MDN. ...
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.
log(`String does not contain "${substr}"`) } // String contains "React" The String.includes() method takes two parameters: searchString— The substring to search for within this string. position— The index to start the search from. This parameter is optional. If not specified, the ...
oop s = jniCheck::validate_object(thr, js); if (!s || !java_lang_String::is_instance(s)) ReportJNIFatalError(thr, fatal_non_string); }static inline arrayOop check_is_array(JavaThread* thr, jarray jArray) { ASSERT_OOPS_ALLOWED; ...
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varfs=require('fs');varcheckConstants=require('check-constants');varoptions={};varcontents=fs.readFileSync('./contents.js','utf8');varerrors=checkConstants.inspect(contents,options);// -> errors will contain possible variables that need extraction ...
If the Array.indexOf() method returns a value other than -1, the arrays contain common elements. index.jsconst arr1 = ['pizza', 'cake', 'cola']; const arr2 = ['pizza', 'beer']; const contains = arr1.some(element => { return arr2.indexOf(element) !== -1; }); console.lo...
String and Integers in Java are often used for storing data, but sometimes we might want to check if one data type contains elements compatible with another data type or not.As we know that a String can contain alphabets, symbols, and numbers, it is useful to determine the type of data ...