startsWith() method determines whether a string begins with the characters of a specified string, returning
false as appropriate.
startsWith(searchString) startsWith(searchString, position)
The characters to be searched for at the start of this string. Cannot be a regex. All values that are not regexes are coerced to strings, so omitting it or passing
startsWith()to search for the string
"undefined", which is rarely what you want.
The start position at which
searchStringis expected to be found (the index of
searchString's first character). Defaults to
true if the given characters are found at the beginning of the string, including when
searchString is an empty string; otherwise,
This method lets you determine whether or not a string begins with another string. This method is case-sensitive.
const str = "To be, or not to be, that is the question."; console.log(str.startsWith("To be")); // true console.log(str.startsWith("not to be")); // false console.log(str.startsWith("not to be", 10)); // true
|ECMAScript Language Specification |
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