JavaScript String Includes, JavaScript String Includes and How To Use Examples

A definitive JavaScript String Includes guide with example : JavaScript was basically designed as a client-side scripting language. A large number of websites still use JavaScript as a client-side programming language. They can further use JavaScript to make the pages of the website interactive, respond to users in a very short time, and create user friendly  interfaces, without less server interaction and reduce server load.

It further executes the JavaScript code efficiently through the V8 JavaScript engine. The built-in libraries provided by Node.js further allow developers to run their web applications smoothly without depending on external web servers.

Hence, web developers can use Node.js to write both client-side and server-side code in one language javaScript.

JavaScript String Includes Tutorial

The web programmers can easily extend the functionality and features of JavaScript by using various libraries and frameworks.

The fully-featured JavaScript libraries like AngularJS and Ember allow JavaScript web developers to add functionality and features to complex web applications without writing or using additional code.

At the same time, lightweight JavaScript libraries like React.js and frameworks like react-native make it easier for programmers to complete specific tasks.

As mentioned earlier, JavaScript has come with some of the advanced features provided by modern programming languages like multithreading capability and file read/write options.

But the programming language has been day to day evolving consistently to meet the emerging trends in web application development.

For example, ES06, the latest release of JavaScript simplifies the modern and advanced web application development by providing so many new modules, module loaders, generators, and symbols, along with API and Unicode support.

If you are a  modern web developer then you have to use JavaScript to make their web applications deliver optimal user experience across various devices, operating systems, and browsers. However, they have to be familiar with various types of JavaScript libraries, frameworks, and tools.

They can also combine multiple libraries and frameworks to enhance and extend JavaScript functionality and features according to the requirements of large projects.

What are Strings and how are they useful?

Most of the programming languages provide String as a basic data type. The main thing is that you have to know about the programming language you are working with, whether the String data type of your language is Mutable or Immutable. For example, Java and Python have String types that are Immutable.

If you try to treat an immutable String as mutable it will throw an error and you may be confused.

One of the foremost basic and customary tasks in any programming language is finding whether a string contains a give, I feel what we are searching for maybe a method which has the identical name that matches with our intention (determining if x contains y), and returns an easy truth or false.

Unfortunately, with the exception of matching on a daily expression instead of a string, the behavior is a twin of indexOf.

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JavaScript String Includes Examples

var philosophers = "Aquinas, Maimonedes, and Avicenna";

var me = "Joshua";

function printPhilosopherStatus (person) {

var personRegExp = new RegExp(person);

if (personRegExp.test(philosophers)) {

console.log(person + " may be a philosopher.");

} else isn't a philosopher.");

}

}

// Output: "Joshua isn't a philosopher."

printPhilosopherStatus(me);

This is a far better way because during this case method itself returns true or false. the strategy name also communicates intent more clearly than indexOf.

Unfortunately, if we try to match a string which uses characters like ? or ., we have a controversy. Because they need special meanings in regular expressions, we have to cater to escaping them.

Which means this is not a really good general purpose solution. additionally, the code could still use some improvement in clearly communicating its intent.

Finally we come to String.prototype contains method.n substring or not. First, let’s take a glance at using String.prototype’s indexOf method.

var philosopher = "Aquinas, Maimonedes, and Avicenna";

var me = "Joshua";


function printPhilosopherStatus (person) {
if (anyString.indexOf(person) >= 0) {

console.log(person + " may be a philosopher]");

} else isn't a philosopher.");
}
}

// Output: "Joshua isn't a philosopher."

printPhilosopherStatus(me);

The indexOf method is sometimes recommended as a simple thanks to test the presence of a substring, that’s not really its purpose. the work of the indexOf method is to return the index at which a given substring is found. within the case that no match is found, it’ll return -1. means we will use it, but the clarity of the code may suffer. Ideally

var philosophers = "Aquinas, Maimonedes, and Avicenna";

var me = "Joshua";

function printPhilosopherStatus (person) {

if (philosophers.contains(person)) {

console.log(person + " may be a philosopher.");

} else isn't a philosopher.");

}

}

// Output: "Joshua isn't a philosopher."

printPhilosopherStatus(me);

This has all the features that we’ve been searching for. It returns a boolean value, and therefore the method name clearly conveys the intent of our code.

Unfortunately, there’s a controversy. The contains method may be a proposal for the following version of JavaScript (ES06) and has only been implemented in FireFox 19+ thus far.

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If you’d wish to use something kind of like contains, for now, your best way is to use a third-party library like String.js.

the function contains (a, b)

var philosophers = "Aquinas, Maimonedes, and Avicenna";

var me = "Joshua";

function printPhilosopherStatus (person) {

if (aContainsB(philosophers, person)) {

console.log(person + " may be a philosopher.");

} else isn't a philosopher.");

}

}

function aContainsB (a, b)


var philosophers = "Aquinas, Maimonedes, and Avicenna";

var me = "Joshua";


function printPhilosopherStatus (person) {

if (aContainsB(philosophers, person)) {

console.log(person + " may be a philosopher.");

} else {

console.log(person + " isn't a philosopher.");

}

}


// Output: "Joshua isn't a philosopher."

printPhilosopherStatfunction aContainsB (a, b)
var philosophers = "Aquinas, Maimonedes, and Avicenna";

var me = "Joshua";


function printPhilosopherStatus (person) {

if (aContainsB(philosophers, person)) {

console.log(person + " may be a philosopher.");

} else {

console.log(person + " isn't a philosopher.");

}

}


// Output: "Joshua isn't a philosopher."

printPhilosopherStatfunction aContainsB (a, b)
var philosophers = "Aquinas, Maimonedes, and Avicenna";

var me = "Joshua";


function printPhilosopherStatus (person) {

if (aContainsB(philosophers, person)) {

console.log(person + " may be a philosopher.");

} else {

console.log(person + " isn't a philosopher.");

}

}


// Output: "Joshua isn't a philosopher."

print PhilosopherS that

// Output: "Joshua isn't a philosopher."

printPhilosopherStatus(me);

And this is often an outline of a number of the ways in which you’ll determine if a string contains a substring or not in JavaScript.

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Conclusion

JavaScript is an amazing language to work with. You can find various functions and methods to do a particular task in various ways depending on your need. Hopefully, you might have understood the concept of Javascript string includes.

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