Software programing

👽The concat() Method👽 concat() joins two or more strings: Example👻 var text1 = "software"; var text2 = "programming"; text3 = text1.concat(" ",text2); The concat() method can be used instead of the plus operator. These two lines do the same: Example👻 var text = "Hello" + " " + "World!"; var text = "Hello".concat(" ","World!"); @software_programming1

👽Converting to Upper and Lower Case A string is converted to upper case with toUpperCase(): Example👻 var text1 = "programming channel!"; // String var text2 = text1.toUpperCase(); // text2 is text1 converted to upper A string is converted to lower case with toLowerCase(): Example👻 var text1 = "Programming Channel!"; // String var text2 = text1.toLowerCase(); // text2 is text1 converted to lower @software_programming1

😏This is the list of special characters that can be added to a text string with the backslash sign: Code Outputs \' single quote \" double quote \\ backslash \n new line \r carriage return \t tab \b backspace \f form feed @software_programming1

. Global JavaScript Variables A variable declared outside a function, becomes GLOBAL. A global variable has global scope: All scripts and functions on a web page can access it. Example var carName = " vitz"; // code here can use carName function myFunction() { // code here can use carName } @software_programming1

JavaScript Scope In JavaScript, objects and functions are also variables. In JavaScript, scope is the set of variables, objects, and functions you have access to. JavaScript has function scope: The scope changes inside functions. Local JavaScript Variables Variables declared within a JavaScript function, become LOCAL to the function. Local variables have local scope: They can only be accessed within the function. Example // code here can not use carName function myFunction() { var carName = "vitz"; // code here can use carName } Since local variables are only recognized inside their functions, variables with the same name can be used in different functions. Local variables are created when a function starts, and deleted when the function is competed

objectName.methodName()

#Object_Methods An object method is a property that contains a function definition. Use the following #syntax to access an object method.

var course = {name: "JS", lessons: 41}; document.write(course.name.length); //Outputs 2

JavaScript's built-in length property is used to count the number of characters in a property or string.

objectName.propertyName //or objectName['propertyName'] This example demonstrates how to access the age of our person object. var person = { name: "John", age: 31, favColor: "green", height: 183 }; var x = person.age; var y = person['age'];

#javascript_Object_Properties You can access object properties in two ways.

var person = { name: "John", age: 31, favColor: "green", height: 183 };

#Javascript_Objects JavaScript Objects JavaScript variables are containers for data values. Objects are variables too, but they can contain many values. Think of an object as a list of values that are written as name:value pairs, with the names and the values separated by colons. Example:

JavaScript Data Types JavaScript variables can hold many data types: numbers, strings, arrays, objects and more: varlength=16; // Number var lastName ="Johnson"; // String var cars = ["Saab", "Volvo", "BMW"]; // Array var x = {firstName:"John", lastName:"Doe"}; // Object JavaScript Has Dynamic Types JavaScript has dynamic types. This means that the same variable can be used as different types: Example var x; // Now x is undefined var x = 5; // Now x is a Number var x = "John"; // Now x is a String @software_programming1

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