JavaScript – Check if String starts with Specific Substring
To check if a string str
starts with a specific string searchStr
in JavaScript, call startsWith() method on this string str
, and pass the other string searchStr
as argument.
startsWith() method returns a boolean value. The return value is true
if specified string is present at the start of this string, or else, it returns false
.
Syntax
The syntax to check if string str1
starts with the string searchStr
is
str.startsWith(searchStr)
Examples
The following is a quick example to check if string str1
starts with the string searchStr
in JavaScript.
var str = 'Hello World'; var searchStr = 'Hel'; var result = str.startsWith(searchStr);
We may use the return value of startsWith() method as a condition in If statement.
var str = 'Hello World'; var searchStr = 'Hel'; if ( str.startsWith(searchStr) ) { //str starts with specified searchStr } else { //str does not start with specified searchStr }
In the following example, we take two strings: str
and searchStr
in script, and check if string str
starts with the string searchStr
using startsWith() method. We shall display the result in a div.
index.html
Conclusion
In this JavaScript Tutorial, we learned how to check if a string starts with a specified string in JavaScript, using startsWith() method, with examples.