[JavaScript tutorial] JavaScript Operators

[JavaScript tutorial] JavaScript Operators

JavaScript Operators

Operator = is used to assign values.

Operator + is used for value adding.

Operator = is used to assign values to JavaScript variables.

Arithmetic Operator + is used to add up values.

Instance

Specify the variable value and add the value together:

y=5;z=2;x=y+z;

After the preceding statement is executed, the value of x is:

7

JavaScript Arithmetic Operators

Operator

Description

Example

X operation result

Y operation result

Online instance

+ Addition x = y + 2 7 5 instances»

-Subtraction x = y-2 3 5 instances»

* Multiplication x = y * 2 10 5 instances»

/Division x = y/2 2.5 5 instances»

% Modulo (remainder) x = y % 2 1 5 instance»

++ Auto-increment x = ++ y 6 6 instances»

X = y ++ 5 6 instances»

-- Auto-Subtract x = -- y 4 4 instance»

X = y -- 5 4 instances»

JavaScript assignment operator

The value assignment operator is used to assign values to JavaScript variables.

Given x = 10 and y = 5, the following table describes the assignment operators:

Operator

Example

Equivalent

Calculation Result

Online instance

= X = y x = 5 instances»

+ = X + = y x = x + y x = 15 instances»

-= X-= y x = x-y x = 5 instances»

* = X * = y x = x * y x = 50 instances»

/= X/= y x = x/y x = 2 instance»

% = X % = y x = x % y x = 0 instance»

+ Operator used for strings

+ Operators are used to add up (join) text values or string variables ).

To connect two or more string variables, use the + operator.

Instance

To connect two or more string variables, use the + operator:

txt1="What a very";txt2="nice day";txt3=txt1+txt2;

The calculation result of txt3 is as follows:

What a verynice day

To add spaces between two strings, you need to insert spaces into a string:

Instance

txt1="What a very ";txt2="nice day";txt3=txt1+txt2;

After the preceding statement is executed, the txt3 variable contains the following values:

What a very nice day

Or insert spaces into the expression ::

Instance

txt1="What a very";txt2="nice day";txt3=txt1+" "+txt2;

After the preceding statement is executed, the txt3 variable contains the following values:

What a very nice day

Addition of strings and numbers

The sum of the two numbers is returned. If the number and string are added, the string is returned, as shown in the following example:

Instance

x=5+5;y="5"+5;z="Hello"+5;

The output results of x, y, and z are:

1055Hello5

Rule: if you add a number to a string, the result is a string!

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