JSFiddle - React, Tailwind, and code Playground
HTML
<p id="method1"></p>
<p> </p>
<p id="method2"></p>
JavaScript
let items = ['JS', 'PHP', 'RUBY'];
let replacedItem = items.splice(items.indexOf('RUBY'), 1, 'PYTHON')
console.log(replacedItem) //['RUBY']
console.log(items) //['JS', 'PHP', 'PYTHON']