2023-09-29 10:40:14
`in` operator checks if the specified property is in the specified object [...] [Link] Array [1,2,3,4] is an object {0: 1, 1: 2, 2: 3, 3: 4, length: 4} Doing `k in l` is checking if l has something on prop k l[0] === 1 l[4] === undefined 'length' in l === true To check values: [Link] NEEDS_MORE_RATINGS(27-1-4) Author
2023-09-29 11:37:25
In JavaScript, the 'x in y' operator is used to check if an object contains a key. '4 in [0,1,2,3,4]' is false because, like most languages, in JS arrays start from 0. Checking that an array contains a value can be done with 'y.includes(x)'. [Link] NEEDS_MORE_RATINGS(8-2-7) Author
2023-09-29 11:45:19
The in operator checks if the property exist on a given object. The property “0” exists on array “l” [Link] NEEDS_MORE_RATINGS(0-0-1) Author
2023-09-29 11:56:10
NNN. Es un meme de programación. NEEDS_MORE_RATINGS(1-0-2) Author
2023-09-30 07:55:34
While the situation in the post exists because the `in` operator checks for the presence of a key in the object, it is also true that its name is misleading and JavaScript's terrible type juggling is a set of mis-features that easily results in confusion or unintended outcomes. NEEDS_MORE_RATINGS(3-0-2) Author