Assignment operator : Assignment « Operators « JavaScript Tutorial

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JavaScript Tutorial » Operators » Assignment

2. 4. 1. Assignment operator

The basic format of the assignment operator is:


x = 6;

The assignment operator can also be stacked to create simultaneous assignments.


x = y = z = 6;

Multiple assignment operators are evaluated from right to left.


y = (x = 3) + 4;

the value 3 is assigned to the variable x, which is then added to the value 4 and assigned to the variable y.

Once the expression is fully evaluated, y will contain the value 7.


<html>

<SCRIPT LANGUAGE="JavaScript">

<!--

    x = 1;

    y = 2;

    z = 3;



    document.write("<U>After single assignment</U><BR>");

    document.write("x=",x,"<BR>y=",y,"<BR>z=",z,"<BR>");



    document.write("<U>After multiple assignment</U><BR>");

    document.write("x=",x,"<BR>y=",y,"<BR>z=",z,"<BR>");



    x = (y = 17) + (2 * (z = 2));



    document.write("<U>After multiple assignment in one expression</U><BR>");



    document.write("x=",x,"<BR>y=",y,"<BR>z=",z,"<BR>");



// -->

</SCRIPT>

</html>

2. 4. Assignment
	2. 4. 1.	Assignment operator
	2. 4. 2.	x += 2 (Compound Plus)
	2. 4. 3.	x -= 2 (Compound Subtraction)
	2. 4. 4.	x *= 2 (Compound Multiply)
	2. 4. 5.	x /= 2 (Multiply Divide)
	2. 4. 6.	Advanced Assignment Operators
	2. 4. 7.	Assignment by Value Versus by Reference

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