This document discusses JavaScript break statements, type conversion, and regular expressions (RegEx). It provides examples of using break statements to exit loops and switch statements. It explains that type conversion changes a value from one data type to another, such as converting strings to numbers. Finally, it describes RegEx as patterns used to match text and provides syntax examples for creating regular expressions and using regex methods like exec, test, and replace.

1. JavaScript
“Break, Type conversion, RegEx"
Shivam Gupta ( Full Stack Web Developer )
+91-9711626192

2. Overview
 JS Break
 Type Conversion
 RegEx.

3. JS Break Statement
 The break statement terminates the current loop, switch, or label statement and
transfers program control to the statement following the terminated statement.
 The break statement "jumps out" of a loop.
 The break statement used to "jump out" of a switch() statement.
 The break statement breaks the loop and continues executing the code after the
loop
 Syntax
break [label];
*label Optional.

4. Break Statement Example
 The break statement with loop.
 Example
for (i = 0; i < 10; i++) {
if (i === 3) { break; }
text += "The number is " + i + "<br>";
}
 The break statement with switch
var Animal = 'Giraffe';
switch (Animal) {
case 'Cow':
case 'Giraffe':
case 'Dog':
case 'Pig':
console.log('This animal will go on Noah's Ark.');
break;
case 'Dinosaur':
default:
console.log('This animal will not.');
}

5. Type Conversion
 Type conversion is converting one type of data to another type.
 JavaScript variables can be converted to a new variable and another data type:
 By the use of a JavaScript function
 Automatically by JavaScript itself
 Number() converts to a Number, String() converts to a String, Boolean() converts to
a Boolean.
 Example:
 Converting Strings to Numbers: Number("3.14")
 Converting Booleans to Strings: String(false)
 Numbers to Strings: String(123)

6. RegEx
 Regular expressions are used to perform pattern-matching and "search-and-
replace" functions on text.
 In JavaScript, regular expressions are also objects.
 Regex syntax
 /pattern/modifiers;
 Creating a regular expression
 var re = /pattern/modifiers ; or var re = new RegExp(”pattern”, ”modifiers”)
 Modifiers
 i, g, m
 Regex Object Methods
 exec, test, match, search, replace, split

7. Regex
 RegEx Pattern
 A regular expression pattern is composed of simple characters, such as /abc/, or a
combination of simple and special characters, such as /ab*c/ or /sss(d+).d*/.
 Special characters in regular expressions.
 /, ^, $, *, +, ., ?, w, [], n, (x), (x|y)
 Example:
 Executes a search:
 var myRe = /d(b+)d/g;
var myArray = myRe.exec("cdbbdbsbz"); // returns an array
 Search and Replace:
 var re = /(w+)s(w+)/;
var str = "John Smith";
var newstr = str.replace(re, "$2, $1");
console.log(newstr);

8. Thank you