When I try to print a simple string with console.log(), it does not print the string out but rather it returns undefined:
> console.log("Hello")
< undefined
What is wrong?
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1You do require to post your code/test environment in order to get help. – Ullas Hunka Jul 13 '18 at 08:05
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2Are you sure it doesn't print `Hello` followed by a new line on which `undefined` appears? – David Thomas Jul 13 '18 at 08:05
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2Are you sure that the report of `undefined` doesn't occur **after** the log of `"Hello"` and not instead of it? – Quentin Jul 13 '18 at 08:05
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1https://i.imgur.com/nTYWxwq.png — Cannot reproduce. You need to provide a [mcve] – Quentin Jul 13 '18 at 08:06
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It doesn't print `undefined` it returns `undefined`. – vibhor1997a Jul 13 '18 at 08:07
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@David Thomas. No, it only prints undefined – Prince Jul 13 '18 at 08:07
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Add a screeshot or something. – vibhor1997a Jul 13 '18 at 08:08
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`console.log("Hello")` will print `Hello`, then return `undefined`. If you need to return "Hello", you can define a function that will return "Hello", then run it: `function test(){ return "Hello";} test();` – Matthias Schmidt Jul 13 '18 at 08:08
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@GuillaumeGeorges — No. The OP says the output is *only* `undefined`, not the expected output followed by `undefined`. – Quentin Jul 13 '18 at 08:10
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@MatthiasSchmidt — No. The OP says the output is *only* `undefined`, not the expected output followed by `undefined`. – Quentin Jul 13 '18 at 08:11
3 Answers
3
Check your console log levels configuration. Chances are you unchecked info :
Guillaume Georges
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because when you write in console it will print the return value of the function, when the function you called have no explicit return javascript implicitly call return undefined.
so when you write console.log("hello") it will return undefined so console print undefined for you
Mohaalak
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