If the first expression evaluates to something that is greater thanĪlert("No. If the first expression evaluates to something that is greater or If the first expression evaluates to something that is Key to making all of this work are the conditional operators themselves. Statement knows which block of code to execute. The operator (aka a conditional operator) defines a relationship between an expression The general format of such expressions are: Two or more expressions to establish a true or false Our expression will involve what are known asĬonditional operators that help us to compare between In most cases, our expression will rarely be a simple variable that We'll tackle that next by taking a deeper look at conditions. So far, all of this should seem really boring.Ī large part of the reason for this is because we haven't turned up the complexity knob You shall not pass! because our expression now evaluates to This time when you run this code, you will see an alert with the text Now, go ahead and change the value of the Our expression (the thing following the keyword The code responsible for making this work is the following lines from our example: let safeToProceed = true
See an alert with the text You shall pass! displayed: Save this document with the name if_else.htm and preview it in your browser. Create a new HTML document and add the following markup and code into it: To make sense of this, let's take a look at a simpleĮlse statement in action. The most common conditional statement we will use in our code is the if / else statement or just To kick your JavaScript skills into outer space, everything you need to become a JS expert is available in both paperback and digital editions. These are the digitalĮquivalents of the decisions we make where our code does somethingĭifferent depending on whether something is true or This may not be evident from the code we've written so far, but weĪre going to fix that. This generalization especially applies to everything our computerĭoes. (☃️), but that's generally how we, others, and pretty much all living Going more broad, every decision you and I make can be modeled as a series of trueĪnd false statements. The answer to that question determines your next step and ultimately whether you were a t-shirt, hoodie, or jacket.
By the time you step outside your door, youĬonsciously or subconsciously will have made hundreds ofĭecisions with each decision having a certain effect on whatįor example, if the weather looks cold outside, you might decide toĪt each stage of making a decision, you ask yourself a question that can be answered as true or false. Look outside to see what the weather is like.īrush your teeth. From the moment you wake up, whether you realize it or
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