Length is 1 or 2 ? 😐

Question

JavaScript

Masoud

Length is 1 or 2 ? 😐

0

22.06.2022

5 ответов

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Masoud Автор вопроса

array.length isn't necessarily the number of items in the array: var a = ['car1', 'car2', 'car3']; a[100] = 'car100'; a.length; // 101 The length of the array is one more than the highest index. jesussssss !!!

0

22.06.2022

Masoud Автор вопроса

Masoud
array.length isn't necessarily the number of items...

so how to get actual length of array ? @TRGWII

0

22.06.2022

Masoud Автор вопроса

Thomas
Language: js Code: const actualLength = (arr) => ...

yeah I know we can loop over that :)) also found this Object.keys(array).length

0

22.06.2022

Simen

Thomas
Language: js Code: const actualLength = (arr) => ...

Please stop using var. It was deprected 7 years ago. Use const or let instead

0

22.06.2022

Thomas · Accepted Answer

Thomas

Masoud
so how to get actual length of array ? @TRGWII

Language: js Code: const actualLength = (arr) => { let length = 0; for (let i = 0; i < arr.length; i++) { if (i in arr) length++; } return length; }; var a = ['car1', 'car2', 'car3']; a[100] = 'car100'; console.log(actualLength(a)); Output: 4

0

22.06.2022

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