17 C
Jaipur
Friday, November 27, 2020

Javascript String to Int – Linux Hint

Must read

Nokia: German court refers dispute Nokia-Daimler licensing dispute to European Court – Latest News

DUESSELDORF: A German court referred a dispute over patent licence fees between Nokia , the Finnish telecoms equipment maker, and German carmaker Daimler to...

Google is planning to make adding chapters easier in YouTube videos

Google added chapters feature to YouTube to make things easier for content creators as well as viewers. However, currently creators are...

This country will help people buy smartphones that can be repaired easily

The European Commission is on track to introduce a new law that will make it mandatory for gadget makers to disclose how...

Laptop Stand: Portronics launches portable laptop stand ‘My Buddy Hexa 22’ at Rs 1,299

Portronics has launched My Buddy Hexa 22, a portable laptop stand, in India. My Buddy Hexa 22 laptop stand...

Javascript is a language of the web and managing data is an important aspect of any programming language. We often need to manipulate or manage variables according to our needs. Sometimes we need to perform arithmetic operations so, we can’t do that with strings. We need integers to do that.

Since Javascript is a language of the web now. Speed optimization has become very important in this era. We have to think and manage every single byte if we can. We must know and care about memory because the strings take more memory than integers. We need to keep things very simple. But, what if we have to perform some arithmetic operations. If, variables are in string type. Do we have to reinitialize the variable with integer type? Of course not! It will even take more memory. But, what if we have a function that will convert or parse the string into the integer and we can perform our tasks. So, in this article, we are gonna see that how can we convert or parse a string into the integer using the parseInt() function.

The parseInt() is a function to which we can pass a string as an argument and it will return us an integer if it exists.

This function returns NaN(Not a Number). If, no number found in that string. This function also returns NaN if there exists any character before the number.

Syntax

Let’s take a look at the syntax of the parseInt() function.

parseInt(value [, base]);

Here,

Value is the string that we want to parse into the integer.

And the base is the base number of the provided string to which we want to convert into a decimal number. It is an optional value.

Let’s have look at a couple of examples to understand more clearly.

Examples

parseInt(“34”); // 34</td>

Now, let’s try to give a float number.

As you can see. It only prints the 34.

Let’s try to put a space before or after the number.

It worked fine.

But, if we put any character before the number.

parseInt(“the 34”); // NaN

It prints NaN(Not a Number). The same applies to the empty string.

Pro tip

Now, what if we try to give the base number along with the value. Like, the base of the binary number system is 2.

parseInt(“34”, 2); // NaN

Ok, since 3 and 4 are not the numbers of a binary number system. It prints NaN.

Now if we provide it a true binary number. It should print the decimal number against that binary number.

parseInt(“10011011”, 2); // 155

Here comes an interesting thing about this function. Like, if we keep on providing the binary number 0’s and 1’s. It will keep on converting that number into the decimal number system. But, when we start to give a non-binary number system. It will stop right there and won’t convert any further. But, until we keep on giving the binary numbers. It keeps on converting.

parseInt(“100110113432”, 2); //155

Alright! We can also do the same tasks with the Octal number system and Hexadecimal number system using the parseInt() function.

Conclusion

In this article, we have learned that how can we use the parseInt() function to convert the string into an integer. We have also learned about some exceptional cases of the parseInt() function and how does it help in converting the number systems as well. I hope this article was beneficial and helpful for understanding the conversion of strings into integers. So, keep on learning javascript with linuxhint.com.

Source link

- Advertisement -

More articles

LEAVE A REPLY

Please enter your comment!
Please enter your name here

Latest article

Nokia: German court refers dispute Nokia-Daimler licensing dispute to European Court – Latest News

DUESSELDORF: A German court referred a dispute over patent licence fees between Nokia , the Finnish telecoms equipment maker, and German carmaker Daimler to...

Google is planning to make adding chapters easier in YouTube videos

Google added chapters feature to YouTube to make things easier for content creators as well as viewers. However, currently creators are...

This country will help people buy smartphones that can be repaired easily

The European Commission is on track to introduce a new law that will make it mandatory for gadget makers to disclose how...

Laptop Stand: Portronics launches portable laptop stand ‘My Buddy Hexa 22’ at Rs 1,299

Portronics has launched My Buddy Hexa 22, a portable laptop stand, in India. My Buddy Hexa 22 laptop stand...

Watch: Korea gets its first ‘drone taxi’ flying over 3 cities

South Korea is all set to deploy drone taxis to tackle the traffic congestion. The Korean government had announced Korean...