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Gambling is making its way through the US as sports betting expands and states allow the construction of new casinos. What was once a tourist attraction for Vegas or Atlantic City visitors is now a popular pastime.

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Slot props allow us to turn slots into reusable templates that can render different content based on input props. This is most useful when you are designing a reusable component that encapsulates data logic while allowing the consuming parent component to customize part of its layout. Welcome to the slot machines section of Our goal with this guide to slot machines is to provide the most comprehensive resource for people interested in slots anywhere on the Internet. This page covers the main topics in broad strokes.

While sports betting is making the most headway in the US, online casinos and land-based gaming are making more gradual moves to new markets. Illinois recently allowed for the construction of six new casinos while nearby Michigan is gearing up to launch online casinos.

And where there are casinos, be they land-based or online, there are also slots. The glitzy, ring-dinging contraptions are often a source of confusion for rookie gamblers. But slots are actually fairly easy to understand, and I’ve compiled a beginner’s guide so you know how they work and what to expect when you spin the reels.

Are Slot Machines Rigged?

This is the first question many slot players have, and it’s a fair one. Slot machines are not “rigged” in the sense that the casino chooses when a jackpot or big win hits.

Slots are games of chance, just like blackjack, craps, sports betting, or poker. But the mechanics of slot games vary, and the house edge is bigger when you play slots compared to most table games.

The House Edge

The house edge is the profit a casino (or online casino site) makes on each bet you place. You can still win money; the house edge represents a percentage of all bets placed and what the casino will make on those based on the match of a given game.

Online slots and slot machines have a house edge ranging from 2% to 15%, though the 5-10% range is most common. By comparison, blackjack usually has a house edge of 0.5% and double zero roulette sits around 5%.

How To Play

It’s easy enough to sit down at a slot machine, put $20, and spin. But understanding how the actual games work makes the experience much more fun.

Understanding Denominations

You might find slots that advertise themselves as “penny slots.” Even though the name may make you think they cost a penny per spin, it’s not quite so simple. “Penny slots” mean that each pay line you’re betting on costs a penny. A pay line is a left-to-right pathway that connects symbols on the reels. Some are straight lines and some taking a more winding path, such as in the shape of a “W.”

When you play a slot, you choose how many lines to bet on, and this varies based on the slot you’re playing. Some have 243 lines, some have 50, and there are plenty of others in between. The more paylines you hit on a given spin, the more you win.

The more you bet, the more pay lines you have access to. So if you’re max betting on a penny slot with 50 pay lines, each individual spin would cost you $.50.

The cost of each bet changes from one slot to the next, so always check the machine or online slot you’re playing to be sure you know where your money is going.

Symbols And Paylines

Every unique symbol on a slot machine has a specific value. If the symbol ends up in a pay line with identical symbols, you earn a payout based on the value of each one in the pay line.

Slots typically make their highest paying symbols images of the main character on which the slot is based or something similar. Perhaps a pot of gold on a leprechaun game. Lower-paying symbols are usually A, K, Q, J, and 10, similar to cards at a table game.

Spinning The Reels

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This, of course, is the ultimate draw of slot machines. The reels blur as they spin into oblivion, then slow to a stop and hopefully get you a winning pay line (or multiple). Depending on how you play, you’ll have a few options for spinning.

Most slot machines have a button that kicks off the spin, while others have the traditional mechanical lever. Some have both, giving you an option. There’s no difference in outcome with either method, but it’s a unique thrill to pull the physical lever.

For online slots players, spinning usually comes in the form of a quick tap of the screen. Certain online slot themes let you auto spin, continuously repeating spins and automatically logging any wins.

Bonuses And Jackpots

If you’ve seen someone win big on a slot game, it’s likely thanks to a bonus or a jackpot. Though you might be inclined to think they’re the same thing, there are crucial differences.


Bonuses are triggered by events during normal slot play. This often means landing three specific bonus symbols on a single spin. There are countless ways to trigger a bonus, though, and slot makers are always thinking of new mechanics.

Bonuses take many shapes and sizes. Many give you a number of free spins with added flair, like a whole row of wild symbols or a payout multiplier.

In many cases, bonuses also give you the opportunity to win a jackpot.


Jackpots are the big wins, the multi-hundred or -thousand dollar hits that you see in movies and on TV. There are two common jackpot types.

Some jackpots can be hit during normal play, and others are triggered by bonuses.

Local Progressive Jackpots

Every time you spin the reels on a slot, you’re contributing to the larger jackpot pool. Machines usually have a top box component or a special area used to display the current jackpot levels.

Local jackpots take from either a single machine or a small group of slot machines, such as a bank of five neighboring machines. As a result, these jackpots don’t get quite as high as their wide area progressive counterparts but can still reach multiple thousands of dollars.

Wide Area Progressive Or Linked Jackpots

Wide area progressive jackpots take from every dollar put into a large number of machines. Because they can pull from a wider pool of players (even across multiple casinos), these jackpots can reach much higher amounts. These are the jackpots that can reach hundreds of thousands of dollars or higher.

Need Help? Slots Have Guides Built-In

If you’re having trouble figuring out how a slot works, try clicking the “Help” or “?” button. Most video slots and all online slots have this option. It will open a page that tells you the value of each symbol, how to hit the bonuses, and more helpful info.

If you’re playing on a mechanical slot machine on the casino floor, you can always ask a casino employee for more information.

You’re browsing the documentation for v2.x and earlier. For v3.x, click here.


This page assumes you’ve already read the Components Basics. Read that first if you are new to components.

In 2.6.0, we introduced a new unified syntax (the v-slot directive) for named and scoped slots. It replaces the slot and slot-scope attributes, which are now deprecated, but have not been removed and are still documented here. The rationale for introducing the new syntax is described in this RFC.

Slot Content

Vue implements a content distribution API inspired by the Web Components spec draft, using the <slot> element to serve as distribution outlets for content.

This allows you to compose components like this:

Then in the template for <navigation-link>, you might have:

When the component renders, <slot></slot> will be replaced by “Your Profile”. Slots can contain any template code, including HTML:

Or even other components:

If <navigation-link>‘s template did not contain a <slot> element, any content provided between its opening and closing tag would be discarded.

Compilation Scope

When you want to use data inside a slot, such as in:

That slot has access to the same instance properties (i.e. the same “scope”) as the rest of the template. The slot does not have access to <navigation-link>‘s scope. For example, trying to access url would not work:

As a rule, remember that:

Everything in the parent template is compiled in parent scope; everything in the child template is compiled in the child scope.

Fallback Content

There are cases when it’s useful to specify fallback (i.e. default) content for a slot, to be rendered only when no content is provided. For example, in a <submit-button> component:

We might want the text “Submit” to be rendered inside the <button> most of the time. To make “Submit” the fallback content, we can place it in between the <slot> tags:

Now when we use <submit-button> in a parent component, providing no content for the slot:

will render the fallback content, “Submit”:

But if we provide content:

Then the provided content will be rendered instead:

Named Slots

Updated in 2.6.0+. See here for the deprecated syntax using the slot attribute.

There are times when it’s useful to have multiple slots. For example, in a <base-layout> component with the following template:

For these cases, the <slot> element has a special attribute, name, which can be used to define additional slots:

A <slot> outlet without name implicitly has the name “default”.

To provide content to named slots, we can use the v-slot directive on a <template>, providing the name of the slot as v-slot‘s argument:

Now everything inside the <template> elements will be passed to the corresponding slots. Any content not wrapped in a <template> using v-slot is assumed to be for the default slot.

However, you can still wrap default slot content in a <template> if you wish to be explicit:

Either way, the rendered HTML will be:

Note that v-slot can only be added to a <template> (with one exception), unlike the deprecated slot attribute.

Scoped Slots

Updated in 2.6.0+. See here for the deprecated syntax using the slot-scope attribute.

Sometimes, it’s useful for slot content to have access to data only available in the child component. For example, imagine a <current-user> component with the following template:

We might want to replace this fallback content to display the user’s first name, instead of last, like this:

That won’t work, however, because only the <current-user> component has access to the user and the content we’re providing is rendered in the parent.

To make user available to the slot content in the parent, we can bind user as an attribute to the <slot> element:

Attributes bound to a <slot> element are called slot props. Now, in the parent scope, we can use v-slot with a value to define a name for the slot props we’ve been provided:

In this example, we’ve chosen to name the object containing all our slot props slotProps, but you can use any name you like.

Abbreviated Syntax for Lone Default Slots

In cases like above, when only the default slot is provided content, the component’s tags can be used as the slot’s template. This allows us to use v-slot directly on the component:

This can be shortened even further. Just as non-specified content is assumed to be for the default slot, v-slot without an argument is assumed to refer to the default slot:

Note that the abbreviated syntax for default slot cannot be mixed with named slots, as it would lead to scope ambiguity:

Whenever there are multiple slots, use the full <template> based syntax for all slots:

Destructuring Slot Props

Internally, scoped slots work by wrapping your slot content in a function passed a single argument:

That means the value of v-slot can actually accept any valid JavaScript expression that can appear in the argument position of a function definition. So in supported environments (single-file components or modern browsers), you can also use ES2015 destructuring to pull out specific slot props, like so:

This can make the template much cleaner, especially when the slot provides many props. It also opens other possibilities, such as renaming props, e.g. user to person:

You can even define fallbacks, to be used in case a slot prop is undefined:

Dynamic Slot Names

New in 2.6.0+

Dynamic directive arguments also work on v-slot, allowing the definition of dynamic slot names:

Named Slots Shorthand

New in 2.6.0+

Similar to v-on and v-bind, v-slot also has a shorthand, replacing everything before the argument (v-slot:) with the special symbol #. For example, v-slot:header can be rewritten as #header:

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However, just as with other directives, the shorthand is only available when an argument is provided. That means the following syntax is invalid:

Instead, you must always specify the name of the slot if you wish to use the shorthand:

Other Examples

Slot props allow us to turn slots into reusable templates that can render different content based on input props. This is most useful when you are designing a reusable component that encapsulates data logic while allowing the consuming parent component to customize part of its layout.

For example, we are implementing a <todo-list> component that contains the layout and filtering logic for a list:

Instead of hard-coding the content for each todo, we can let the parent component take control by making every todo a slot, then binding todo as a slot prop:

Now when we use the <todo-list> component, we can optionally define an alternative <template> for todo items, but with access to data from the child:

However, even this barely scratches the surface of what scoped slots are capable of. For real-life, powerful examples of scoped slot usage, we recommend browsing libraries such as Vue Virtual Scroller, Vue Promised, and Portal Vue.

Deprecated Syntax

The v-slot directive was introduced in Vue 2.6.0, offering an improved, alternative API to the still-supported slot and slot-scope attributes. The full rationale for introducing v-slot is described in this RFC. The slot and slot-scope attributes will continue to be supported in all future 2.x releases, but are officially deprecated and will eventually be removed in Vue 3.

Named Slots with the slot Attribute

Deprecated in 2.6.0+. See here for the new, recommended syntax.

To pass content to named slots from the parent, use the special slot attribute on <template> (using the <base-layout> component described here as example):

Or, the slot attribute can also be used directly on a normal element:

There can still be one unnamed slot, which is the default slot that serves as a catch-all for any unmatched content. In both examples above, the rendered HTML would be:

Scoped Slots with the slot-scope Attribute

Deprecated in 2.6.0+. See here for the new, recommended syntax.

To receive props passed to a slot, the parent component can use <template> with the slot-scope attribute (using the <slot-example> described here as example):

Here, slot-scope declares the received props object as the slotProps variable, and makes it available inside the <template> scope. You can name slotProps anything you like similar to naming function arguments in JavaScript.

Here slot='default' can be omitted as it is implied:

The slot-scope attribute can also be used directly on a non-<template> element (including components):

The value of slot-scope can accept any valid JavaScript expression that can appear in the argument position of a function definition. This means in supported environments (single-file components or modern browsers) you can also use ES2015 destructuring in the expression, like so:

Using the <todo-list> described here as an example, here’s the equivalent usage using slot-scope:

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