ES6, introduced in 2015, added the
startsWith() method to the String object prototype.
This is the way to perform this check in 2018.
This means you can call
startsWith() on any string, provide a substring, and check if the result returns
'testing'.startsWith('test') //true 'going on testing'.startsWith('test') //false
This method accepts a second parameter, which lets you specify at which character you want to start checking:
'testing'.startsWith('test', 2) //false 'going on testing'.startsWith('test', 9) //true