Actions speak louder than words; I prefer to demonstrate with code:
//global variable
var siblings = [];
var rand = new Date().getTime();
siblings.push('uin_' + rand);
alert(siblings['uin_' + rand]); // undefined
Why is it coming up as undefined? My main goal is to create a global object that acts as a storage for information about other objects. Going back to my issue... I added the value, then tried to alert it but it's showing as undefined... why?
.push adds the element to the array, siblings[0] stores it as the first element in the previously empty array.
If you prefer to choose the key yourself, you can:
siblings = {};
siblings['key'] = 'something';
Otherwise, iterate through the array to access each element:
for ( var l = siblings.length, i = 0; i<l; ++i ) {
alert( siblings[i] )
}
Note: arrays are objects, so technically I could have used siblings['key'] = 'something'; on the array, but it's not recommended.
family is a collection of objects. You should not use an array for this purpose. Instead, you can create an object and assign key-value pairs to it.
var family = {};
var uniqueId = +new Date();
family['person_' + uniqueId] = "John Doe";
alert(family['person_' + uniqueId]);
By inserting a string into the first position of the array, you subsequently attempted to access a property that does not exist on the array object.
Consider utilizing Array.pop() as an alternative approach.
To tap into an array, you must utilize array indices, which essentially dictate whether you are seeking the 1st, 2nd, 3rd, etc., element.
For this scenario, employ siblings[0].
Due to the fact that siblings is an array and not an associative array, there are two possible solutions:
// Declaring a global variable as an array
var siblings = [];
var randNum = new Date().getTime();
siblings.push('uin_' + randNum);
alert(siblings[0]); // Will return undefined
// Declaring a global variable as an associative array
var siblings = {};
var randomNumber = new Date().getTime();
siblings['uin_' + randomNumber] = 'some value';
alert(siblings['uin_' + randomNumber]); // Will return 'some value'
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