String startsWith()
In JavaScript, String.startsWith()
method is used to check if the string starts with a specific prefix string or search string.
Syntax
str.startsWith(search, start)
where
str
is a string.search
is a string.start
is an integer, and optional.
startsWith()
method returns true
if the string str
starts with the specified search
string, or else it returns false
. If start
is provided, only the part of the string str
from the specified start
index position is considered for checking.
Examples
1. In the following program, we check if string value in name
starts with search string 'ap'
.
let name = 'apple';
let output = name.startsWith('ap');
console.log(output);
2. In the following program, we check if string value in name
starts with search string 'ba'
.
let name = 'apple';
let output = name.startsWith('ba');
console.log(output);
3. In the following program, we check if string value in name
starts with search string 'pp'
with a start index of 1
.
let name = 'apple';
let output = name.startsWith('pp', 1);
console.log(output);