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# Interaction: alert, prompt, confirm
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This part of the tutorial aims to cover JavaScript "as is", without environment-specific tweaks.
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In this part of the tutorial we cover JavaScript language "as is", without environment-specific tweaks.
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But we'll still be using the browser as our demo environment, so we should know at least a few of its user-interface functions. In this chapter, we'll get familiar with the browser functions `alert`, `prompt` and `confirm`.
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Sometimes, we need to perform different actions based on different conditions.
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To do that, we use the `if` statement and the conditional (ternary) operator which we will be referring to as the "question mark" operator`?` for simplicity.
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To do that, we can use the `if` statement and the conditional operator `?`, that's also called a "question mark" operator.
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## The "if" statement
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There can be more `else if` blocks. The final `else` is optional.
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## Ternary operator '?'
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## Conditional operator '?'
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Sometimes, we need to assign a variable depending on a condition.
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alert(accessAllowed);
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```
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The so-called "ternary" or "question mark" operator lets us do that in a shorter and simpler way.
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The so-called "conditional" or "question mark" operator lets us do that in a shorter and simpler way.
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The operator is represented by a question mark `?`. The formal term "ternary" means that the operator has three operands. It is actually the one and only operator in JavaScript which has that many.
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The operator is represented by a question mark `?`. Sometimes it's called "ternary", because the operator has three operands. It is actually the one and only operator in JavaScript which has that many.
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The syntax is:
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```js
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let accessAllowed = (age >18) ?true:false;
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```
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Technically, we can omit the parentheses around `age > 18`. The question mark operator has a low precedence, so it executes after the comparison `>`.
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Technically, we can omit the parentheses around `age > 18`. The question mark operator has a low precedence, so it executes after the comparison `>`.
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This example will do the same thing as the previous one:
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A value is returned in its original form, without the conversion.
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In other words, a chain of OR `"||"` returns the first truthy value or the last one if no such value is found.
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In other words, a chain of OR `"||"` returns the first truthy value or the last one if no truthy value is found.
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For instance:
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1.**Getting the first truthy value from a list of variables or expressions.**
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Imagine we have several variables which can either contain data or be `null/undefined`. How can we find the first one with data?
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Imagine we have a list of variables which can either contain data or be `null/undefined`. How can we find the first one with data?
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We can use OR `||`:
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alert(x); // 1
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```
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An assignment is a simple case. Otherside effects can also be involved.
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An assignment is a simple case. There may be side effects, that won't show up if the evaluation doesn't reach them.
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As we can see, such a use case is a "shorter way of doing `if`". The first operand is converted to boolean. If it's false, the second one is evaluated.
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