Is it possible for JavaScript to create a sparse array similar to what Bash can do in one line?
names=([0]="Bob" [1]="Peter" [20]="$USER" [21]="Big Bad John")
§ Creating Arrays
Can JavaScript achieve the same with sparse arrays?
Is it possible for JavaScript to create a sparse array similar to what Bash can do in one line?
names=([0]="Bob" [1]="Peter" [20]="$USER" [21]="Big Bad John")
§ Creating Arrays
Can JavaScript achieve the same with sparse arrays?
While JavaScript does have a sparse array literal, it can be quite cumbersome to work with.
var x = [8,,,,4,,,,6]
Using objects instead of arrays may feel more natural for JavaScript in this scenario, especially considering the challenge of counting commas between elements.
var names = {0: "Bob", 1: "Peter", 20: "$USER", 21: "Big Bad John"};
Whether integers are quoted or not, they are converted to strings for use as keys in the object, essentially functioning as a hash. Accessing values using [] is the same whether the key is looked up as an integer or a string, such as names[0] and names['0'].
For creating an actual array, a possible function for sparse array creation is provided:
function sparseArray() {
var array = [];
for (var i = 0; i < arguments.length; i += 2) {
var index = arguments[i];
var value = arguments[i + 1];
array[index] = value;
}
return array;
}
var names = sparseArray(0, "Bob", 1, "Peter", 20, "$USER", 21, "Big Bad John");
Keep in mind that this function lacks error checking, so omitting the final argument could result in setting 21 to undefined, and using a non-integer key would add it as an object property instead...
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