The functionality works, but the readability is poor. The developer must write code to verify whether an integer value is greater than or less than -1. In ES6,using indexOf()method always return integer or -1. Javascript array contains an element Using Es6 syntax.It returns true if an element is found, or else not found. includes syntax array.includes(element)įromIndex is optional starting from position to search and is useful for performance improvement. So, have to add a validation check to make its truthy/falsy values. It always returns an integer, not a Boolean value. We already have the indexOf() method that checks the value that exists in an array and returns the position in an array if found, else returns -1. Array in JavaScript || Full-Stack Web-Development Course #24ĮS7, also called ECMAScript2006 is the latest javascript language released in 2017.Įs7 introduced one method to, which includes a method in the array to check object or element exists in an array.
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