Typescript Functions | Basics Tutorial for Beginners

In this Typescript Functions | Basics Tutorial for Beginners you will learn about TS Functions, parameters and return types along with optional params, default param values, type guards, type aliases and more.

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Typescript Functions | Basics Tutorial for Beginners

(00:00) Intro
(00:05) Welcome
(00:17) Type Aliases
(03:11) Literal Types
(06:07) Basic Functions
(07:29) Functions with no return value
(10:40) The function keyword
(11:58) Function Type Aliases
(14:06) Function Interface
(15:28) Optional Parameters
(18:10) Default Parameters
(21:39) Function with Rest Params
(25:21) The never type
(27:54) Using the never type
(30:25) Custom Type Guard

📚 Suggested Pre-requisites for this Typescript course:

📚 Tutorial References:

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Was this Typescript Functions basics tutorial helpful? If so, please share. Let me know your thoughts in the comments.

#typescript #functions #tutorial

[smithahegade]

No waste of time.. Every bit of 30 minutes is soooo useful. Thanks a lot

[alseynidiop]

This comes exactly at the time I am learning typescript, you become my favorite Youtube teacher.

[Scottni]

Awesome video Dave!! You are very quickly becoming my favorite web dev teacher on youtube!

[insteresting]

Awesome tutorial as always!! I noticed that at 30:58, you could also return directly typeof value === 'number', without explicitly using the ternary statement and it would work fine as well.

[ahmad-murery]

Although I don't use it often, but once you get used to typescript it's hard to get back to regular JavaScript.

1:42 I think we can make use of the already declared type stringOrNumber like this:
type stringOrNumberArray = stringOrNumber[]

Thanks Dave,

[flowerofash]

this is probably infinitely more easier than scrollling through typescript documentations, thank you sir

[mostafaentezami]

Thank you for your excellent teaching method🙏

[kk]

very clear explanation and worth learning!

[mariolazzari]

This lesson is really full of useful tips: great job!

[andresbreuer]

As always Dave... amazing series!! Thank you so much!!

[natediaz]

When i see your these tuts, i feel ts is really need to use

[lahcenaouina]

Hi dave thank u so much for effort u are from my fav yt, please can u do Java EE and Spring boot pleassse

[noSweatSuperDry]

The lessons are great, but it would be great, if you gave us some problem in between to solve, which makes channel and viewers more interactive. But, thank you very much for your lessons.

[LevPleshkov]

31:00 Why not just ``` return typeof value === 'number' ``` ?

[IramKahkashan]

Hi Dave, Thank you to provide such a precise and awesome tutorial, Tell me one thing plz in VS Code I want to view the basic code of .push function, how can I view the source code of .push function or any function just like useSate() hook function or any other hook?

[moneyfr]

Thank you for your work I really like your videos.

[Grishopping]

Thank you DAVE day by day I am advancing with your excellent pedagogy of your videos... A query the end of this series of TYPSCRIPT videos will only cover javascipt or do you plan to extend it to use in REACT

Jose Grillo greets you from Venezuela

ESPAÑOL

Gracias DAVE dia a dia voy avanzando con tus excelente pedagogia de tus videos... Una consulta el acande de esta serie de videos de TYPSCRIPT solo cubrira javascipt o lo piensas extender para usar en REACT

Te saluda Jose Grillo desde Venezuela

[djumarong]

it's redundant to use the ternary operator here: typeof value === 'number' ? true : false

[moneyfr]

can you do some small exercises to apply all that you teach us

[DiegoBM]

They shouldn't have allowed the interface with a method to be valid for a function signature... it sure looks hacky, counterintuitive, and hard to read