x >= y is generally equivalent to !(x = y and x = y is generally equivalent to x > y || x = y, except for a few cases: There are two sets of comparison operators, equality/inequality and relational.Įquality and inequality comparison operators check to see if one value is equal to another value, or if it is not equal to another value.The operands are compared using the same algorithm as the Less than operator, with the result negated. With ||, you only need one of them to evaluate to true and with & you still need all of them to evaluate to true. The list of comparisons can be as long as you want or need it to be. With || and &, you can actually have more than two comparisons that you're looking at, but you need at least two. The nullish coalescing operator is similar to the or operator, but instead of moving to the second statement if the first statement has any falsy value, it only moves on if the first statement is null or undefined. So if you say "not true", you're looking for the value to be false. When you use the not ( !) operator, you're looking for the opposite value of what you're comparing. When you use the and ( &) operator, you're telling the program to do something if this value is true and if that value is true. As long as one of them evaluates to true, you'll be happy. When you use the or ( ||) operator, you're telling the program to do something if this value is true, or if that value is true. There are four logical operators that we'll cover: or ( ||), and ( &), not ( !), and nullish coalescing ( ?). In this section we'll learn all about them. You've may have seen them, but not known their names or the ways that they can be used. Logical and comparison operators are used frequently in JavaScript applications. JavaScript Fundamentals - Course Conclusion.JavaScript Fundamentals - Arrays in JavaScript.Stringify-ing Objects and Parsing Objects.JavaScript Fundamentals - Objects in JavaScript.Strings, Numbers, and Dates Exercise Review.Strings, Numbers, and Dates Introduction.JavaScript Fundamentals - Strings, Numbers, & Dates.Functions in JavaScript Exercise 2 Review.Functions in JavaScript Exercise 1 Review.Introduction to Functions in JavaScript.JavaScript Fundamentals - Functions in JavaScript.JavaScript Fundamentals - Looping in JavaScript.Logical and Comparison Operators Conclusion.Logical Operators - Nullish Coalescing Exercise Review.Logical Operators - Nullish Coalescing Exercise.Logical Operators - Nullish Coalescing.Logical Operators - Not Exercise Review.Logical Operators - And Exercise Review.Logical Operators - Or Exercise Review.Comparison Operators - Relational Exercise Review.Comparison Operators - Relational Exercise.Comparison Operators - Equality and Inequality Exercise Review.Comparison Operators - Equality and Inequality Exercise.Comparison Operators - Equality and Inequality.Introduction to Logical and Comparison Operators.JavaScript Fundamentals - Logical and Comparison Operators.JavaScript Fundamentals - The JavaScript Console.JavaScript Fundamentals - The this Keyword.JavaScript Fundamentals - Primitive Types.Introduction to Variables and Global Scope.JavaScript Fundamentals - Variables and Scope.JavaScript Fundamentals Course Introduction.JavaScript Fundamentals - What is JavaScript?.
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