javascript function arguments.length giving wrong valueAccessing arguments object using ES6How do JavaScript closures work?What is the most efficient way to deep clone an object in JavaScript?Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?How do I remove a property from a JavaScript object?var functionName = function() vs function functionName() Which equals operator (== vs ===) should be used in JavaScript comparisons?How do I include a JavaScript file in another JavaScript file?What does “use strict” do in JavaScript, and what is the reasoning behind it?How to check whether a string contains a substring in JavaScript?How do I remove a particular element from an array in JavaScript?

I’m planning on buying a laser printer but concerned about the life cycle of toner in the machine

Email Account under attack (really) - anything I can do?

Python: next in for loop

What typically incentivizes a professor to change jobs to a lower ranking university?

Mage Armor with Defense fighting style (for Adventurers League bladeslinger)

Why not use SQL instead of GraphQL?

Can a Warlock become Neutral Good?

Why "Having chlorophyll without photosynthesis is actually very dangerous" and "like living with a bomb"?

Modeling an IPv4 Address

What are the differences between the usage of 'it' and 'they'?

Why don't electron-positron collisions release infinite energy?

How can I make my BBEG immortal short of making them a Lich or Vampire?

Can I ask the recruiters in my resume to put the reason why I am rejected?

Fully-Firstable Anagram Sets

How do I create uniquely male characters?

A newer friend of my brother's gave him a load of baseball cards that are supposedly extremely valuable. Is this a scam?

How does one intimidate enemies without having the capacity for violence?

Approximately how much travel time was saved by the opening of the Suez Canal in 1869?

Is it possible to do 50 km distance without any previous training?

Smoothness of finite-dimensional functional calculus

Adding span tags within wp_list_pages list items

Why did the Germans forbid the possession of pet pigeons in Rostov-on-Don in 1941?

Why doesn't Newton's third law mean a person bounces back to where they started when they hit the ground?

Minkowski space



javascript function arguments.length giving wrong value


Accessing arguments object using ES6How do JavaScript closures work?What is the most efficient way to deep clone an object in JavaScript?Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?How do I remove a property from a JavaScript object?var functionName = function() vs function functionName() Which equals operator (== vs ===) should be used in JavaScript comparisons?How do I include a JavaScript file in another JavaScript file?What does “use strict” do in JavaScript, and what is the reasoning behind it?How to check whether a string contains a substring in JavaScript?How do I remove a particular element from an array in JavaScript?






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;








-1















enter image description here



concat.js



export default () => 
const argsLength = arguments.length;
if (argsLength === 0)
return [];


const target = arguments[0];
if (argsLength == 1)
return target;


for (let i=1; i<argsLength; i++)
const src = arguments[i];
for (let i=0; i<src.length; i++)
target.push(src[i]);



return target;



test.js



describe('concat should copy', () => 
it('src array into target array', () =>
const result = concat(); // Not passgin any parameters.
expect(result.length).to.equal(0);
);
);


I am debugging a javascript function with no arguments. In the image, the arguments.length is clearly 0. But when it is initialized to a variable, it is becoming 5. Can someone explain what's going on here?










share|improve this question



















  • 4





    How is it clearly zero? arguments comes from the number of parameters passed to the function not the number of parameters defined in the function. So, somewhere you are passing 5 parameters to this function.

    – Get Off My Lawn
    Mar 9 at 2:31












  • @GetOffMyLawn I am not passing any arguments. Updated the post with code

    – lch
    Mar 9 at 3:25











  • I think you are seeing some unexpected behavior here because arrow functions do not have a local binding for arguments. changing to the regular function syntax should give you the correct 0 for the length

    – MimiEAM
    Mar 9 at 3:41











  • @MimiEAM Yes, its the arrow that is causing the issue. Switching to normal syntax solved it. Is there a way to achieve this using arrow functions?

    – lch
    Mar 9 at 3:47






  • 1





    stackoverflow.com/a/40924845/4127542 . this solved the problem

    – lch
    Mar 9 at 3:52

















-1















enter image description here



concat.js



export default () => 
const argsLength = arguments.length;
if (argsLength === 0)
return [];


const target = arguments[0];
if (argsLength == 1)
return target;


for (let i=1; i<argsLength; i++)
const src = arguments[i];
for (let i=0; i<src.length; i++)
target.push(src[i]);



return target;



test.js



describe('concat should copy', () => 
it('src array into target array', () =>
const result = concat(); // Not passgin any parameters.
expect(result.length).to.equal(0);
);
);


I am debugging a javascript function with no arguments. In the image, the arguments.length is clearly 0. But when it is initialized to a variable, it is becoming 5. Can someone explain what's going on here?










share|improve this question



















  • 4





    How is it clearly zero? arguments comes from the number of parameters passed to the function not the number of parameters defined in the function. So, somewhere you are passing 5 parameters to this function.

    – Get Off My Lawn
    Mar 9 at 2:31












  • @GetOffMyLawn I am not passing any arguments. Updated the post with code

    – lch
    Mar 9 at 3:25











  • I think you are seeing some unexpected behavior here because arrow functions do not have a local binding for arguments. changing to the regular function syntax should give you the correct 0 for the length

    – MimiEAM
    Mar 9 at 3:41











  • @MimiEAM Yes, its the arrow that is causing the issue. Switching to normal syntax solved it. Is there a way to achieve this using arrow functions?

    – lch
    Mar 9 at 3:47






  • 1





    stackoverflow.com/a/40924845/4127542 . this solved the problem

    – lch
    Mar 9 at 3:52













-1












-1








-1








enter image description here



concat.js



export default () => 
const argsLength = arguments.length;
if (argsLength === 0)
return [];


const target = arguments[0];
if (argsLength == 1)
return target;


for (let i=1; i<argsLength; i++)
const src = arguments[i];
for (let i=0; i<src.length; i++)
target.push(src[i]);



return target;



test.js



describe('concat should copy', () => 
it('src array into target array', () =>
const result = concat(); // Not passgin any parameters.
expect(result.length).to.equal(0);
);
);


I am debugging a javascript function with no arguments. In the image, the arguments.length is clearly 0. But when it is initialized to a variable, it is becoming 5. Can someone explain what's going on here?










share|improve this question
















enter image description here



concat.js



export default () => 
const argsLength = arguments.length;
if (argsLength === 0)
return [];


const target = arguments[0];
if (argsLength == 1)
return target;


for (let i=1; i<argsLength; i++)
const src = arguments[i];
for (let i=0; i<src.length; i++)
target.push(src[i]);



return target;



test.js



describe('concat should copy', () => 
it('src array into target array', () =>
const result = concat(); // Not passgin any parameters.
expect(result.length).to.equal(0);
);
);


I am debugging a javascript function with no arguments. In the image, the arguments.length is clearly 0. But when it is initialized to a variable, it is becoming 5. Can someone explain what's going on here?







javascript






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Mar 9 at 3:24







lch

















asked Mar 9 at 2:27









lchlch

83622250




83622250







  • 4





    How is it clearly zero? arguments comes from the number of parameters passed to the function not the number of parameters defined in the function. So, somewhere you are passing 5 parameters to this function.

    – Get Off My Lawn
    Mar 9 at 2:31












  • @GetOffMyLawn I am not passing any arguments. Updated the post with code

    – lch
    Mar 9 at 3:25











  • I think you are seeing some unexpected behavior here because arrow functions do not have a local binding for arguments. changing to the regular function syntax should give you the correct 0 for the length

    – MimiEAM
    Mar 9 at 3:41











  • @MimiEAM Yes, its the arrow that is causing the issue. Switching to normal syntax solved it. Is there a way to achieve this using arrow functions?

    – lch
    Mar 9 at 3:47






  • 1





    stackoverflow.com/a/40924845/4127542 . this solved the problem

    – lch
    Mar 9 at 3:52












  • 4





    How is it clearly zero? arguments comes from the number of parameters passed to the function not the number of parameters defined in the function. So, somewhere you are passing 5 parameters to this function.

    – Get Off My Lawn
    Mar 9 at 2:31












  • @GetOffMyLawn I am not passing any arguments. Updated the post with code

    – lch
    Mar 9 at 3:25











  • I think you are seeing some unexpected behavior here because arrow functions do not have a local binding for arguments. changing to the regular function syntax should give you the correct 0 for the length

    – MimiEAM
    Mar 9 at 3:41











  • @MimiEAM Yes, its the arrow that is causing the issue. Switching to normal syntax solved it. Is there a way to achieve this using arrow functions?

    – lch
    Mar 9 at 3:47






  • 1





    stackoverflow.com/a/40924845/4127542 . this solved the problem

    – lch
    Mar 9 at 3:52







4




4





How is it clearly zero? arguments comes from the number of parameters passed to the function not the number of parameters defined in the function. So, somewhere you are passing 5 parameters to this function.

– Get Off My Lawn
Mar 9 at 2:31






How is it clearly zero? arguments comes from the number of parameters passed to the function not the number of parameters defined in the function. So, somewhere you are passing 5 parameters to this function.

– Get Off My Lawn
Mar 9 at 2:31














@GetOffMyLawn I am not passing any arguments. Updated the post with code

– lch
Mar 9 at 3:25





@GetOffMyLawn I am not passing any arguments. Updated the post with code

– lch
Mar 9 at 3:25













I think you are seeing some unexpected behavior here because arrow functions do not have a local binding for arguments. changing to the regular function syntax should give you the correct 0 for the length

– MimiEAM
Mar 9 at 3:41





I think you are seeing some unexpected behavior here because arrow functions do not have a local binding for arguments. changing to the regular function syntax should give you the correct 0 for the length

– MimiEAM
Mar 9 at 3:41













@MimiEAM Yes, its the arrow that is causing the issue. Switching to normal syntax solved it. Is there a way to achieve this using arrow functions?

– lch
Mar 9 at 3:47





@MimiEAM Yes, its the arrow that is causing the issue. Switching to normal syntax solved it. Is there a way to achieve this using arrow functions?

– lch
Mar 9 at 3:47




1




1





stackoverflow.com/a/40924845/4127542 . this solved the problem

– lch
Mar 9 at 3:52





stackoverflow.com/a/40924845/4127542 . this solved the problem

– lch
Mar 9 at 3:52












0






active

oldest

votes












Your Answer






StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");

StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);













draft saved

draft discarded


















StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55073425%2fjavascript-function-arguments-length-giving-wrong-value%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown

























0






active

oldest

votes








0






active

oldest

votes









active

oldest

votes






active

oldest

votes















draft saved

draft discarded
















































Thanks for contributing an answer to Stack Overflow!


  • Please be sure to answer the question. Provide details and share your research!

But avoid


  • Asking for help, clarification, or responding to other answers.

  • Making statements based on opinion; back them up with references or personal experience.

To learn more, see our tips on writing great answers.




draft saved


draft discarded














StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55073425%2fjavascript-function-arguments-length-giving-wrong-value%23new-answer', 'question_page');

);

Post as a guest















Required, but never shown





















































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown

































Required, but never shown














Required, but never shown












Required, but never shown







Required, but never shown







Popular posts from this blog

Identity Server 4 is not redirecting to Angular app after login2019 Community Moderator ElectionIdentity Server 4 and dockerIdentityserver implicit flow unauthorized_clientIdentityServer Hybrid Flow - Access Token is null after user successful loginIdentity Server to MVC client : Page Redirect After loginLogin with Steam OpenId(oidc-client-js)Identity Server 4+.NET Core 2.0 + IdentityIdentityServer4 post-login redirect not working in Edge browserCall to IdentityServer4 generates System.NullReferenceException: Object reference not set to an instance of an objectIdentityServer4 without HTTPS not workingHow to get Authorization code from identity server without login form

2005 Ahvaz unrest Contents Background Causes Casualties Aftermath See also References Navigation menue"At Least 10 Are Killed by Bombs in Iran""Iran"Archived"Arab-Iranians in Iran to make April 15 'Day of Fury'"State of Mind, State of Order: Reactions to Ethnic Unrest in the Islamic Republic of Iran.10.1111/j.1754-9469.2008.00028.x"Iran hangs Arab separatists"Iran Overview from ArchivedConstitution of the Islamic Republic of Iran"Tehran puzzled by forged 'riots' letter""Iran and its minorities: Down in the second class""Iran: Handling Of Ahvaz Unrest Could End With Televised Confessions""Bombings Rock Iran Ahead of Election""Five die in Iran ethnic clashes""Iran: Need for restraint as anniversary of unrest in Khuzestan approaches"Archived"Iranian Sunni protesters killed in clashes with security forces"Archived

Can't initialize raids on a new ASUS Prime B360M-A motherboard2019 Community Moderator ElectionSimilar to RAID config yet more like mirroring solution?Can't get motherboard serial numberWhy does the BIOS entry point start with a WBINVD instruction?UEFI performance Asus Maximus V Extreme