Not, all, and or are all considered logical operators.
IntroductionThe field of computer science has many foundations in mathematical logic. If you have a familiarity with logic, you know that it involves truth tables, Boolean algebra, and comparisons to determine equality or difference. Show The JavaScript programming language uses operators to evaluate statements that can aid in control flow within programming. In this tutorial, we’ll go over logical operators. These are commonly used with conditional
statements, and the Comparison OperatorsIn JavaScript, there are a number of comparison operators that you can use to evaluate whether given values are different or equal, as well as if a value is greater than or less than another. Often, these operators are used with stored values in variables. Comparison operators all return a
Boolean (logical) value of The table below summarizes the comparison operators available in JavaScript.
Let’s go into each operator in detail. EqualityThe equality operator measures whether values on either side of the operator are equal. Let’s consider the following:
Because
If we instead test whether
With this equivalency expression, you can also test other data types such as strings and Booleans. We’ll use a string example below.
In the first instance, the expression returned Worth noting, is that the
Even though the first line uses a number data type, and the second line tests
Because this operator is not strict about data type, it can support users entering strings instead of numbers, for example. There is no need to convert data types to test equivalency. There are many cases where you may use comparison operators like the
Here, if
the student enters There are many potential applications of comparison operators in JavaScript, and they will help you control the flow of your program. Now that you have a foundation with a few examples for InequalityThe Let’s consider an example.
For this example,
For a statement of inequality to be considered
In this second example, the two values on either side of the operator are equal, so the expression is not true. IdentityThe Here’s an example:
We’ll receive the following output.
The example indicates that Because this operator is strict, you will need to keep in mind that you may need to convert user-entered data from one data type to another, for instance, when working with the identity operator. This may help you keep data types consistent throughout your program. Non IdentityLike We’ll review the following examples.
The output for the above will be as follows.
In this example, since Greater thanThe greater than symbol in JavaScript may be familiar to you from math: Like the Let’s consider the following examples.
We’ll receive the following output:
In the first
instance, Greater than or equalSimilarly, the operator for greater than or equal to will evaluate whether one operand meets the threshold of the other. This operator is typed as Our examples:
Because Less thanThe less than operator appears as the mirror version of the
greater than operator: Consider the following examples as a demonstration.
Here, Less than or equalThe opposite of greater than or equal, the less than or equal operator — Here are a few examples.
The first expression evaluates to Note: Be sure not to confuse the less than or equal operator ( To understand how these comparison operators
can work together in a program, refer to our Logical OperatorsIn JavaScript, there are three logical operators, which connect two or more programming statements to return a These logical operators are summarized in the table below.
Let’s review each of these operators in more detail. ANDThe AND operator is represented by two ampersands — For example, with AND we can check if something is both high quality and has a low price.
Since both variables evaluate to be ORThe OR operator is represented by two pipes — In this example, we’ll check if something is either
Since one of the two conditions ( NOTThe NOT operator is represented by an exclamation point —
In the above statement, The NOT operator is a bit tricky to understand at first. The important part to remember is that NOT checks whether something evaluates to be false. ConclusionLogical operators are the building blocks of flow control in JavaScript programming. Using these operators effectively will help you develop programs that evaluate statements and move to the next stage based on whether a statement is true or false. To continue learning more about JavaScript, check out our How To Code in JavaScript series, and our JavaScript tag. Are and and or logical operators?Logical operators combine relations according to the following rules: The ampersand (&) symbol is a valid substitute for the logical operator AND . The vertical bar ( | ) is a valid substitute for the logical operator OR . Only one logical operator can be used to combine two relations.
Which is a not or and or logical operator?The logical operator *NOT is used to negate logical variables or constants. *AND and *OR are the reserved values used to specify the relationship between operands in a logical expression. The ampersand symbol (&) can replace the reserved value *AND, and the vertical bar (|) can replace *OR.
Which one is not a logical operator?The NOT logical operator reverses the true/false outcome of the expression that immediately follows. The NOT operator affects only the expression that immediately follows, unless a more complex logical expression is enclosed in parentheses. You can substitute ~ or ¬ for NOT as a logical operator.
What are the types of logical operators?There are three logical operators: and , or , and not . The semantics (meaning) of these operators is similar to their meaning in English.
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