• Concatenation : concatenate is another word for add. Concatenating two strings simply means adding or attatching them to one another.
  • Operator: +

x = "My name is ";
y = "Hulk Hogan, ";
z = "Brothur";
const sentence = x + y + z;

Q : What is the value of the variable sentence?

Note that this operator (+) is also used for numerical addition.

• You may ask how you are supposed to specify that you are adding strings instead of numbers, and the answer is that you do not have to.
• If any value you are adding is a string, the compiler automatically uses the + operator to concatenate values to the string, even if they are numbers. The result is a string.
• For example:

var cents = 93;
var sentenceWithNumbers = "I have " + 16 + 
  " dollars and " + cents + " cents.";
console.log(sentenceWithNumbers);

• Note that between each value or variable added, another addition sign needs to be used to concatenate the entire string.
• It is good practice to pay attention to where spaces should be inserted so that the sentence’s formatting is not confusing and bunched together when the string is printed out.
• Typically if you are printing a string and then a new variable or string, you want to make sure there is a space included at the end of the first string, or the beginning of the second.

• Concatenate-Equals : assigning a variable to its original value plus some specified value concatenated to it
  • Operator: +=

x = "My name is ";
y = "Hulk Hogan,";
z = "Brothur";
var sentence = x + y + z;
x += y + z;

Q : What is the value of variable x? Is this equal to the value of sentence?

Exercise

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