JavaScript: The Ultimate Guide to Understand JavaScript Code and its Fundamentals. Discover Literal and Control Flow. Learn Variables, Functions, Object and the Best jQuery. by Mark Graph

Author:Mark Graph [Graph, Mark]
Language: eng
Format: azw3
Published: 2020-01-30T16:00:00+00:00

The String Concatenation Operator

The + operator can also be used to combine two strings into a single string:

var s = prompt ("Enter your name.", "");

alert ("Your name is " + s + ".") ;

One common use for string concatenation is to convert a non-string value to a string and combine it with another string, all in a single operation:

var count = 0;

/* code that increments count... */

alert ("Final count: " + count);

If only one of its operands is a string, + converts the other operand to a string and joins the two strings. (The + operator favors a string over a number. If one operand is a string and the other a number, + does not attempt to convert the string to a numeric value and add the two numbers!)

Recall from hat the automatic conversion of a number, boolean value, null, or undefined to a string works as expected and is one of the benign forms of automatic conversion. An easy way to make this conversion is by using the + operator. If you don't want to add any characters, you can just concatenate with an empty string:

var count = 0;

/* code that increments count... * /

/* done incrementing 'count'; now convert it to a string: */

var s = count + "";

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