Operator and implicit conversion rules

Operator and implicit conversion rules

Logic not, logic with, logic or

• Boolean operators includeThe logical not!.Logic and &&.Logic or | |.
• The logical not!No matter what type is applied, it always returns a Boolean value.

• If you are using!!!!!Theta is the same as thetaBoolean()Method, the first exclamation mark converts the operand to a Boolean value, and the second non takes the reverse to get the true Boolean value of the variable.
• Logic and &&A false or false
• Logic or | |A true is true
• Logic or | |If the first operand is true then we don’t evaluate it, we can use it in real life||To avoid assigning values to variablesnullorundifined

Multiplicative operator

• The special rules for multiplicative operators are as follows:

If it is not a numeric operand, it can be converted using the Number() method and then evaluated

The division operator

• The special rules for the division operator are as follows:

If it is not a numeric operand, it can be converted using the Number() method and then evaluated

The modulo operator

• The special rules for the modulo operators are as follows:

If it is not a numeric operand, it can be converted using the Number() method and then evaluated

Exponential operator

• The exponent operator is**, the calculation method is similar toMath.pow()

Console. log(3 ** 2) // outputs 9 console.log(math.pow (3,2)) // outputs 9Copy the code

• The index assignment operator is* * =

let squard = 3; squard **= 2; Console. log(squard) // Prints 9Copy the code

The additive operator

• The additive operator is usually used to find the sum of two numbers
• The rule for the additive operator for two values:

• Rules for the additive operator on strings:

The subtraction operator

• The subtraction operator rules for two values:

Relational operator

• The relational operators includeLess than (<).Greater than (>).Less than or equal to.Greater than or equal to (>=Each of these operations returns a Boolean value.
• Rules for relational operators:

Equality operator

• Equal to (= =) and do not equal (! =), both operators advance the cast to determine whether the operands are equal.
• Equality operator conversion rules:

• Congruent (= = =) and incongruence (! = = =) must be equal without casting, otherwise false. Here is a special case, NULL == UNdipay (return true), null === Undipay (return false).

Conditional operator

• The conditional operator is also known as the ternary expression operator, i.eConditions? Result 1: Result 2, where the condition true returns 1, and false returns 2.

The assignment operator

• For simple assignment operations=You can do it
• The compound assignment operators are shown below, and there is no performance benefit to using these operators.

There are also some other bit operators and compound operators, in the actual development of the use of little, interested in their own information.

Comma operator

• The comma operator is used to perform multiple operations in a single statement. The most common situation is when colleagues declare multiple variables

let num1 = 1 , num2 = 2 , num3 = 3;