Strings
A string can be defined with either single or double quotes:
var firstName = "Steven";
var lastName = 'Gregory';
String comparison in JavaScript is possible using the == comparator. There is no .equals() like we used in Java:
var x = 'hello';
x == 'hello' // true
x == 'squirrel' // false
Skill Drill¶
Do this drill in the Chrome Console.
- Create a new string using double quotes, and include single quotes inside of it.
- Type the variable name into the console and press return, what happened when you included the single quotes within the double quotes?
Now wrap single quotes around double quotes. What is the result?
Add two strings with the
+operator.console.log()the result.Subtract one string from another with the
-operator. What happens?JavaScript's strings are collections of characters (similar to Java). In JavaScript, this means that you can access individual characters of a string with subscript notation similar to Array access in Java:
var greet = "Hello World"; greet[0]; // "H"
- Try it for yourself!
Template Literals¶
Support for a more dynamic string manipulation technique, template literals was added to ES6.
It gives us string expression interpolation for single and multiline strings.
A template String starts with back ticks, ``, as oppoed to single ('') or double ("") quotes.
Variables can be added to a template sting using ${} notation.
var fname = "Douglas";
var lname = "Johnson";
var greetingConcat = "Hello my name is " + fname + " " + lname;
var greetingTemplate = `Hello my name is ${fname} ${lname}`;