console.log reporting inconsistent values

Asked Jun 14 '17 at 17:22

Active Jun 14 '17 at 17:25

Viewed 69 times

I have an array angles which contains five arrays, each of which contain two numbers.

console.log(angles) reports angles[0] to be [1.5707963267948966, 0.7853981633974483]. Natural conclusion is that I made a mistake in my math somewhere.

console.log(angles[0]) reports the same values as above. However, console.log([angles[0][0],angles[0][1]]) reports [1, 0.5], which is the expected result.

Notably, console.log(angles[0]) reports the erroneous numbers in the expanded result, but the preview displays the correct values.

Screenshot

Issue is not present for angles[n] where n is not 0.

What's happening here? Is there an error in console.log?

asked Jun 14 '17 at 17:22

snazzybouche

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Is there some process that updates the values between you logging the array and expanding the details? Hover over the *i*. – Felix Kling Jun 14 '17 at 17:24
Try console.log(angles.slice(0)) – juvian Jun 14 '17 at 17:25
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To add to Felix's comment, the one-line preview is generated at the time you call `console.log()`, but the expanded values are fetched when you click the arrow. – Michael Geary Jun 14 '17 at 17:25
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Or my favorite for this situation: `console.log(JSON.stringify(angles))` (though specifically for an array, `console.log(String(angles))` works too). – T.J. Crowder Jun 14 '17 at 17:26
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@MichaelGeary: I've never heard it put more clearly and simply than that before. Brilliant. *(Cribs for future use...)* – T.J. Crowder Jun 14 '17 at 17:26
@FelixKling There is, I'm calling the log halfway through an AngularJS script. – snazzybouche Jun 14 '17 at 17:39
@MichaelGeary Thanks for the info, I didn't know that. I'll be more careful in future. – snazzybouche Jun 14 '17 at 17:40
@T.J.Crowder Thanks! I'll be using that in future. – snazzybouche Jun 14 '17 at 17:40

console.log reporting inconsistent values

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