Mastering JavaScript: Using startsWith for String Comparisons
February 19, 2024
JavaScript's startsWith()
function checks if a string begins with another string. This is useful for things like data filtering data filtering, form validation or any situation where the start of a string is important. This post shows you how it works.
How to usestartsWith
in JavaScript?
To use the startsWith()
function, apply the following syntax:
string.startsWith(searchString, position)
searchString
is the string you're searching for.position
is an optional integer that specifies where in the string to start the search, defaulting to0
.
Examples
Here are some examples to demonstrate startsWith()
in action:
const str = "Hello, world!"; console.log(str.startsWith("Hello")); // Outputs true console.log(str.startsWith("world", 7)); // Outputs true console.log(str.startsWith("hello")); // Outputs false, due to case sensitivity
You could ship faster.
Imagine the time you'd save if you never had to build another internal tool, write a SQL report, or manage another admin panel again. Basedash is built by internal tool builders, for internal tool builders. Our mission is to change the way developers work, so you can focus on building your product.
Case sensitivity
Since startsWith()
is case-sensitive, convert both the main string and the search string to the same case (either upper or lower) for a case-insensitive comparison.
const str = "Hello, world!"; console.log(str.toLowerCase().startsWith("hello")); // Outputs true
Practical use case
Use startsWith()
to filter filenames with a specific prefix or to ensure user input begins with a required character or word, enhancing data handling and validation.
TOC
February 19, 2024
JavaScript's startsWith()
function checks if a string begins with another string. This is useful for things like data filtering data filtering, form validation or any situation where the start of a string is important. This post shows you how it works.
How to usestartsWith
in JavaScript?
To use the startsWith()
function, apply the following syntax:
string.startsWith(searchString, position)
searchString
is the string you're searching for.position
is an optional integer that specifies where in the string to start the search, defaulting to0
.
Examples
Here are some examples to demonstrate startsWith()
in action:
const str = "Hello, world!"; console.log(str.startsWith("Hello")); // Outputs true console.log(str.startsWith("world", 7)); // Outputs true console.log(str.startsWith("hello")); // Outputs false, due to case sensitivity
You could ship faster.
Imagine the time you'd save if you never had to build another internal tool, write a SQL report, or manage another admin panel again. Basedash is built by internal tool builders, for internal tool builders. Our mission is to change the way developers work, so you can focus on building your product.
Case sensitivity
Since startsWith()
is case-sensitive, convert both the main string and the search string to the same case (either upper or lower) for a case-insensitive comparison.
const str = "Hello, world!"; console.log(str.toLowerCase().startsWith("hello")); // Outputs true
Practical use case
Use startsWith()
to filter filenames with a specific prefix or to ensure user input begins with a required character or word, enhancing data handling and validation.
February 19, 2024
JavaScript's startsWith()
function checks if a string begins with another string. This is useful for things like data filtering data filtering, form validation or any situation where the start of a string is important. This post shows you how it works.
How to usestartsWith
in JavaScript?
To use the startsWith()
function, apply the following syntax:
string.startsWith(searchString, position)
searchString
is the string you're searching for.position
is an optional integer that specifies where in the string to start the search, defaulting to0
.
Examples
Here are some examples to demonstrate startsWith()
in action:
const str = "Hello, world!"; console.log(str.startsWith("Hello")); // Outputs true console.log(str.startsWith("world", 7)); // Outputs true console.log(str.startsWith("hello")); // Outputs false, due to case sensitivity
You could ship faster.
Imagine the time you'd save if you never had to build another internal tool, write a SQL report, or manage another admin panel again. Basedash is built by internal tool builders, for internal tool builders. Our mission is to change the way developers work, so you can focus on building your product.
Case sensitivity
Since startsWith()
is case-sensitive, convert both the main string and the search string to the same case (either upper or lower) for a case-insensitive comparison.
const str = "Hello, world!"; console.log(str.toLowerCase().startsWith("hello")); // Outputs true
Practical use case
Use startsWith()
to filter filenames with a specific prefix or to ensure user input begins with a required character or word, enhancing data handling and validation.
What is Basedash?
What is Basedash?
What is Basedash?
Ship faster, worry less with Basedash
Ship faster, worry less with Basedash
Ship faster, worry less with Basedash
You're busy enough with product work to be weighed down building, maintaining, scoping and developing internal apps and admin panels. Forget all of that, and give your team the admin panel that you don't have to build. Launch in less time than it takes to run a standup.
You're busy enough with product work to be weighed down building, maintaining, scoping and developing internal apps and admin panels. Forget all of that, and give your team the admin panel that you don't have to build. Launch in less time than it takes to run a standup.
You're busy enough with product work to be weighed down building, maintaining, scoping and developing internal apps and admin panels. Forget all of that, and give your team the admin panel that you don't have to build. Launch in less time than it takes to run a standup.
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