string.startsWith(substring [, position]);
Parameters or Arguments
substring It is the set of characters that will be searched for at the begin of string. position Optional. It is the function within string that the search will begin. If this parameter is not provided, the startsWith() approach will default to zero and begin the search at the beginning of the string.
The startsWith() method returns proper if the substring is determined at the start of string. Otherwise, it returns false.
The startsWith() approach performs a case-sensitive search. The first persona in the string is at function 0, the 2nd persona in the string is at role 1, and so on. The startsWith() technique does not trade the price of the unique string.
var totn_string = 'TechOnTheNet'; console.log(totn_string.startsWith('Tech')); console.log(totn_string.startsWith('TECH'));
In this example, we have declared a variable called totn_string that is assigned the string fee of ‘TechOnTheNet’. We have then invoked the startsWith() technique of the totn_string variable to look for a unique set of characters at the start of totn_string.
We have written the output of the startsWith() method to the net browser console log, for demonstration purposes, to exhibit what the startsWith() method returns.
The following will be output to the web browser console log:
As you can see, the startsWith() approach lower back actual for the first call, but false for the 2d call. Because the startsWith() approach performs a case-sensitive search, the substring ‘Tech’ is determined at the begin of the string ‘TechOnTheNet’ but ‘TECH’ is now not found.
Specifying a Position Parameter
Next, let’s see what happens if you specify a position parameter with the startsWith() method.
var totn_string = 'TechOnTheNet'; console.log(totn_string.startsWith('On',4));
The following will be output to the internet browser console log:
In this example, we have set the function parameter to a price of four This potential that the search will start at role four in the string. So in this case, the substring ‘On’ is determined at the begin of the string ‘OnTheNet’ (which is position 4 till the stop of the totn_string variable).
Remember that the first character in the string is at function 0, the 2d personality in the string is at function 1, the 1/3 persona in the string is at function 2, and so on.