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var constに関連するいくつかの情報

おそらく多くの異なるチュートリアルを見てきましたが、var を使用して変数を宣言するチュートリアルもあれば、let や const を使用するチュートリアルもあることに気付いたかもしれません。 キーワードの違いについてすぐに混乱する可能性があるため、このビデオでは、var、let、および const について知っておく必要があるすべてのことを説明します。 それぞれの違いについて説明し、各キーワードをどのような状況で使用する必要があるかを説明します。 JavaScript トピックに関する提案があれば、Let vs Const vs Var の記事でお知らせください: Twitter: GitHub: CodePen: #VarVsLet #JavaScript #WebDevelopment

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Differences Between Var, Let, and Const
Differences Between Var, Let, and Const

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Differences Between Var, Let, and Const。

var const。

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48 thoughts on “Differences Between Var, Let, and Const | var constに関するすべての情報が最も完全です

  1. Nash Brooklyn says:

    wait up! const also allows to assign value outside of block – as many times you would need to assign such value that cannot be changed by hackers – for instance a waiting time to acept a trip request must be 1 minute only – so if a hacker wishes to change that to 60 minutes – const will not let that to happen – const is great to use in many solid inflexible math routines – that can happen all over the code – so if you set the earth radius to its value as per books – then using const will assure it wont be changed by any accidents or bugs in code –

  2. Aadityakiran S says:

    I came from C#. It's pretty simple there. Use var for what you wanna change, const for what you don't wanna change; variable and constant. Simple language for simple people.

  3. Tabanova Aisha says:

    thank you 😀 you shared more differences than my constructor in my Full-Stack Bootcamp! Will subscribe and watch all other videos of yours

  4. Lets get to 1mill without vids says:

    Good video finally understand and I could have used var for something I needed instead of saving it to local storage and grabbing it after 🤦‍♀️

  5. Aidan Joyce says:

    Would like to say, well done and thank you for a clear and concise explanation of the similarities, differences and when to use, Var, Const and Let.
    Watched other videos and without doubt, you nail it better here with both explanation and example.
    Will be watching more of your stuff as this was a great measure stick for the quality of teaching.
    Keep up the great work.

  6. Mark Spindler says:

    You can't redeclare let variables.
    You can't reassign const variables because they are constants, not variables, once assigned.

  7. Feitan says:

    Yes I did learn something thank you very much man it was hard for me to understand this but you explained it in like less than 10 minutes lol you have a good day too 🙂

  8. Quick Maths says:

    5:35 is wrong no? you say const does not allow you to redeclare a variable. But you meant reassign right? (redeclare is also forbidden with let…)

  9. Doza de Trezire says:

    You forgot to say one more thing: when you declare a variable with var keyowrd, this automatically creates a property inside the Window ojbject.. so, if you say for example: var x = 1; and after that you say: console.log(window)… you will see that in the window object you will find the property X with the value of 1. Instead, if you declare a variable with let or const, this won't ceate a property inside the Window object. I guess this was also very important to mention!

  10. Tushar Borawake says:

    var can be attached to global window object but let and const are not. Where actually those get stored ?

  11. Raji Joshi says:

    Thnks for the detailed vid, just one correction: At 5:35-> const does not allow to 're-declare' the variable, actually should be const does not allow to 're-assign' the variable, but let do.

  12. khaktus says:

    While I prefer Kyle's tutorials over the others for various reasons (extent > clarity > simplicity), for this one I'll differ from the praise-storm below – this was just one of the many confusing explanation of the var|let|const topic that I've seen so far.
    This is the problem that many skilled developers have – they assume that as developers they have analytical thinking and provide well structured explanations (naturally, by default) – but I have seen – since the university times to professional days – that the paradoxical situation happens: techies often do the exact opposite: they do not adhere to the structure/hierarchy of the topic, nor the consistent use of terms they set in the beginning. 😀 Something to work on throughout professional life.

    In first part, you repeatedly state that var does and let does not allow to redeclare the variable, then you say the difference between let and const is that const does not allow to redeclare the variable. That paused my brain, while explanations went on. Maybe stating more clearly what is the difference between (your use of) "redeclare" and "redefine" and "reset" and "reassign" … would help. Particularly in this one topic. 🙂

    I'd welcome more "technical" "analytical" (or tabular 😉 ) than the "narrative" approach here. And particularly a consistent use of terms.

    1 minute:
    redeclare:
    var|let|const myThingy = 10
    var|let|const myThingy = 20
    redefine/reassign/reset variable value:
    var|let|const myThingy = 10
    myThingy=20
    redefine object|array items value (not object|array value, which is just its memory address, so that remains "constant"):
    var|let|const myObject = [10, 11];
    myObject[0] = 20

    1 minute:
    | redeclare| reassign value of variable | reassign value of item in the array or property in the object|
    ————————————————————————————————————————————————————
    var yes yes yes
    let no yes yes
    const no no yes

    Also, from the many lessons on the scope, I understood that "scope" is something defining on what level of nesting we are (regardless if it is a function or block or just anything between {}). This perspective was often emphasized. Here, for the first time, I hear that different scope is actually defined by either function or block. Good point here!

  13. Dicky Allen says:

    I can't move on until i know why something works unless i ABSOLUTELY have to. thanks to you i can move toward the light. goodbye everyone…

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