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JavaScript in Practice: Getting Started

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1.Introduction to JavaScript

Getting Started with JavaScript How to Write Comments in JavaScript?

2.DataTypes

Data Types and Arithmetic Operators Playing Around With Strings Comparison and Ternary Operators Null, Undefined and Symbol The let keyword The Object Type Quiz: DataTypes

3.All about Arrays

Introduction to Arrays Manipulating Arrays Quiz

4.Functions and Operators

Functions The typeof Operator Additional Operators Quiz: Functions and Operators

5.Executing Selective Instructions

If, Else If and Else Statements Switch statements The ternary operator Quiz: Executing Selective Instructions

6.Loops

The While Loop The Do-While Loop The For Loop Some more Loops Break and Continue Quiz: Loops

7.Values and Reference Types

Value and Reference Types Mistake: treating a value type as a reference type Mistake: treating a reference type as a value type Quiz: Values and Reference Types

8.Cloning Objects

Shallow Copy Prototypal Inheritance Are Shallow Copies Dangerous?Deep Copy Restricted Deep Copy Implementations Quiz: Cloning Objects

9.Using Strings in Javascript

Javascript Strings Sorting Strings Length of a String And Inserting New Lines Trimming Strings Accessing Characters inside a String Finding the Index of a Substring inside a String Splitting a String into an Array of Substrings Joining Strings Slicing A String Replacing Characters of a String Upper and Lower Case Letters Exercise: String Manipulation Exercise: Join, Map and Split Exercise: String Parsing Exercise: String Slicing

10.JavaScript with HTML and CSS

Creating the Markup Adding JavaScript Code Finishing up with Style HTML Classes: Separation of Concerns

11.The Modern Javascript

JavaScript on the Client JavaScript on the Server Other Important JavaScript Use Cases Ease of Becoming A JavaScript Developer JavaScript Learning Experience According to Science Summary

JavaScript in Practice: Getting Started

Break and Continue

Learn about the usage of break and continue keywords.

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Introduction
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Break

Introduction

We can use break or continue inside the loops:

break exits the closest loop it is in and continues with the next command,
continue skips out from the loop body and jumps back to the condition of the loop.

Example: sum every second element of the numbers array:

Node.js

let numbers = [19, 65, 9, 17, 4, 1, 2, 6, 1, 9, 9, 2, 1];
 
function sumArray( values ) {
    let sum = 0;
    for ( let i in values ) {
        if ( i % 2 == 0 ) continue;
        sum += values[i];
    }
    return sum;
}
console.log("The sum is", sumArray( numbers ));

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