javascript indexof – The indexOf() method is a part of the Array prototype and the String prototype, and therefore it applies to objects of both types.
let index = str.indexOf(substr, [, fromIndex]);
javascript indexof – JavaScript String indexOf()
Contents
let userInput = "Greeting Message, Pakainfo to the best Website."; userInput.indexOf("Pakainfo") userInput.indexOf("Pakainfo")
1) Using indexOf() method example
let userInput = 'finding substring in string'; let index = userInput.indexOf('str'); console.log(index);
2) Using indexOf() to count occurrences of a substring in a string
let userInput = 'Stripe Payment Gateway Integration using PHP'; let subuserInput = 'Gateway'; let count = 0; let index = userInput.indexOf(subuserInput); while(index !== -1) { count++; index = userInput.indexOf(subuserInput, index + 1); } console.log(count);
3) The indexOf() and case-sensitivity
let userInput = 'Free Download Gateway indexOf'; let results = 'Gateway'; let index = userInput.indexOf(results); console.log(index);
Example
let userInput = 'Free Download Gateway indexOf'; let results = 'Gateway'; let index = userInput.toLocaleLowerCase().indexOf(results.toLocaleLowerCase()); console.log(index);
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I am Jaydeep Gondaliya , a software engineer, the founder and the person running Pakainfo. I’m a full-stack developer, entrepreneur and owner of Pakainfo.com. I live in India and I love to write tutorials and tips that can help to other artisan, a Passionate Blogger, who love to share the informative content on PHP, JavaScript, jQuery, Laravel, CodeIgniter, VueJS, AngularJS and Bootstrap from the early stage.