# JavaScript parseInt | Convert a String to Integer Number in Javascript

Convert a String to Integer Number.In this Javascript tutorial, we will demonstrate, the javaScript parseInt () function, you will learn what is parseInt in javascript and what it does. You will not only see many examples, but you will learn from them

JavaScript ParseInt Function.

While working with numbers in javascript, it is necessary to know what you can do with them, but the most important thing is how to do it.

In this Javascript tutorial, we will demonstrate, the javaScript parseInt () function, you will learn what is parseInt in javascript and what it does. You will not only see many examples, but you will learn from them. After finishing this example, you will be familiar with JavaScript Parsing () syntax and where you should use it.

Let’s see Javascript parseInt ().

### Contents

• JavaScript parseInt() Function Syntax
• Example

The javascript parseInt () function returns an integer number by parse the string. If the first character can not be changed in number, the function returns NaN. JavaScript parseInt simple convert a string to an integer number

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#### JavaScript parseInt() Function Syntax

The syntax of javascript parseInt () is very simple. The JavaScript parseInt () should look like this :

``````parseInt(string, radix)
``````
• string Needed. The string you want to be parsed
• radix Not required. The numeral system representing a number.
##### Example

To understand what parseInt is in JavaScript, it is necessary to see an example. Take a look at this parseInt function example – where we parse different numbers and strings :

``````<script>
// returns a Integer no
a = parseInt("30");
document.write('parseInt("30") = ' + a + "<br>");
//  Not a Number character
b = parseInt("40.00");
document.write('parseInt("40.00") = ' + b + "<br>");

// returns NaN on Non numeral character
c = parseInt("2.689");
document.write('parseInt("2.689") = ' + c + "<br>");

// returns Integer value of a Floating point Number
d = parseInt("3.16");
document.write('parseInt("3.16") = ' + d + "<br>");

// only first Number it encounters
e = parseInt("23 12 2019");
document.write('parseInt("23 12 2019") = ' + e + "<br>");

</script>
``````

#### Output

``````parseInt("30") = 30
parseInt("40.00") = 40
parseInt("2.689") = 2
parseInt("3.16") = 3
parseInt("23 12 2019") = 23
``````

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## Programming a Javascript Simon Game Tutorial

In this javascript tutorial, I recorded myself live programming an html5 javascript simon game.

In this javascript tutorial, I recorded myself live programming an html5 javascript simon game.

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## Understanding Memoization And Dynamic Programming in Javascript

In this Javascript tutorial I will explain what memoization is, how to use it, when you should use memoization, how to use memoization, what dynamic programming is, how to use memoization in dynamic programming. Memoization is a big complicated word that you may have never even heard before, but you may be surprised to know that you are most likely already using memoization without even realizing it.

Memoization is a big complicated word that you may have never even heard before, but you may be surprised to know that you are most likely already using memoization without even realizing it. Memoization is just the act of caching values so that they can be calculated quicker in the future. Memoization is really useful in all parts of programming, but where it is most useful is in dynamic programming. In this video I will explain what memoization is, how to use it, and why it is so useful especially in dynamic programming.

🧠 Concepts Covered:

• What memoization is
• When you should use memoization
• How to use memoization
• What dynamic programming is
• How to use memoization in dynamic programming

## JavaScript Tutorial: if-else Statement in JavaScript

This JavaScript tutorial is a step by step guide on JavaScript If Else Statements. Learn how to use If Else in javascript and also JavaScript If Else Statements. if-else Statement in JavaScript. JavaScript's conditional statements: if; if-else; nested-if; if-else-if. These statements allow you to control the flow of your program's execution based upon conditions known only during run time.

Decision Making in programming is similar to decision making in real life. In programming also we face some situations where we want a certain block of code to be executed when some condition is fulfilled.
A programming language uses control statements to control the flow of execution of the program based on certain conditions. These are used to cause the flow of execution to advance and branch based on changes to the state of a program.

JavaScript’s conditional statements:

• if
• if-else
• nested-if
• if-else-if

These statements allow you to control the flow of your program’s execution based upon conditions known only during run time.

• if: if statement is the most simple decision making statement. It is used to decide whether a certain statement or block of statements will be executed or not i.e if a certain condition is true then a block of statement is executed otherwise not.
Syntax:
``````if(condition)
{
// Statements to execute if
// condition is true
}
``````

Here, condition after evaluation will be either true or false. if statement accepts boolean values – if the value is true then it will execute the block of statements under it.
If we do not provide the curly braces ‘{‘ and ‘}’ after if( condition ) then by default if statement will consider the immediate one statement to be inside its block. For example,

``````if(condition)
statement1;
statement2;

// Here if the condition is true, if block
// will consider only statement1 to be inside
// its block.
``````

Flow chart:

Example:

``````<script type = "text/javaScript">

// JavaScript program to illustrate If statement

var i = 10;

if (i > 15)
document.write("10 is less than 15");

// This statement will be executed
// as if considers one statement by default
document.write("I am Not in if");

< /script>

``````

Output:

``````I am Not in if
``````
• if-else: The if statement alone tells us that if a condition is true it will execute a block of statements and if the condition is false it won’t. But what if we want to do something else if the condition is false. Here comes the else statement. We can use the else statement with if statement to execute a block of code when the condition is false.
Syntax:
``````if (condition)
{
// Executes this block if
// condition is true
}
else
{
// Executes this block if
// condition is false
}
``````

Example:

``````<script type = "text/javaScript">

// JavaScript program to illustrate If-else statement

var i = 10;

if (i < 15)
document.write("10 is less than 15");
else
document.write("I am Not in if");

< /script>

``````

Output:

``````i is smaller than 15
``````
• nested-if A nested if is an if statement that is the target of another if or else. Nested if statements means an if statement inside an if statement. Yes, JavaScript allows us to nest if statements within if statements. i.e, we can place an if statement inside another if statement.
Syntax:
``````if (condition1)
{
// Executes when condition1 is true
if (condition2)
{
// Executes when condition2 is true
}
}
``````

Example:

``````<script type = "text/javaScript">

// JavaScript program to illustrate nested-if statement

var i = 10;

if (i == 10) {

// First if statement
if (i < 15)
document.write("i is smaller than 15");

// Nested - if statement
// Will only be executed if statement above
// it is true
if (i < 12)
document.write("i is smaller than 12 too");
else
document.write("i is greater than 15");
}
< /script>

``````

Output:

``````i is smaller than 15
i is smaller than 12 too
``````
• if-else-if ladder Here, a user can decide among multiple options.The if statements are executed from the top down. As soon as one of the conditions controlling the if is true, the statement associated with that if is executed, and the rest of the ladder is bypassed. If none of the conditions is true, then the final else statement will be executed.
``````if (condition)
statement;
else if (condition)
statement;
.
.
else
statement;
``````

Example:

``````<script type = "text/javaScript">
// JavaScript program to illustrate nested-if statement

var i = 20;

if (i == 10)
document.wrte("i is 10");
else if (i == 15)
document.wrte("i is 15");
else if (i == 20)
document.wrte("i is 20");
else
document.wrte("i is not present");
< /script>

``````

Output:

``````i is 20
``````