Why do I get undefined values in my array?
45943
JavaScript "new Array(n)" and "Array.prototype.map" weirdness
53203
Checking for undefined
69714
How can I save arrays of values in the database?
106127
Arrays are Pointers?
40174
Access an array value within an object in PHP
51812
How to add elements to an empty array in PHP?
77302
Accessing different elements in a javascript array
54646
How undefined is undefined behavior?
45322
jQuery Ajax results in undefined
49152
How to add an array to an array?
38438
How to access "key" and "value" from an array passed to a for loop?
146079
All my properties are zero, and my array is zero, even though I have populated them with numbers and objects
60800
PHP: Access Array Value on the Fly
68074
JavaScript 'in' operator for `undefined` elements in Arrays
14660
Undefined variable as function argument javascript
27606
Detecting an undefined object property
88224
How to initialize an array's length in JavaScript?