If I have an array and want to select non-consecutive elements, such as the second and fifth elements, is there a simple method to do this? For example:
a = ["a","b","c","d","e"]
a.select_elements([1,4]) // should yield ["b","e"]
EDIT:
After some reflection, I realized that using
[1,4].map(function(i) {return a[i]})In search of a way to condense your code, one option is to enhance the functionality of Array with this custom method:
Array.prototype.choose_items = function(indexes) {
var items = [];
for (var i=0; i != indexes.length; ++i)
items.push(this[indexes[i]]);
return items;
}
Now you have the flexibility to use the method whenever necessary:
a.choose_items([1,4])
["b", "e"]
Generate a fresh array by selecting specific elements:
var selected_elements = [a[1], a[4]];
Alternatively, you can utilize a function to form a new array based on index locations:
function createNewArrayFromIndices(sourceArray, selectionIndices)
{
var result = [];
for (var i = 0; i < selectionIndices.length; i++) {
var index = selectionIndices[i];
result.push(sourceArray[index]);
}
return result;
}
var selected_elements = createNewArrayFromIndices(a, [1, 4]);
If you want to enhance all arrays without affecting for loops, you can safely add a custom function:
Object.defineProperty(Array.prototype, 'customFunction', {
__proto__: null,
value: function() {
return Array.prototype.slice.call(arguments).map(function(index){ return this[index] }.bind(this));
}
})
To use the custom function:
let arr = [1, 2, 3, 4, 5, 6];
arr.customFunction(1, 4);
Another version of the function without variadic parameters:
Object.defineProperty(Array.prototype, 'customFunction', {
__proto__: null,
value: function(indices) {
return indices.map(function(index){ return this[index] }.bind(this));
}
})
Usage example:
let arr = [1, 2, 3, 4, 5, 6];
arr.customFunction([1, 4]);
Unfortunately, there isn't a built-in feature for this. However, you can accomplish the task by following these steps:
a.select_elements([a[1], a[4]]);
This code snippet creates a new array using the elements a[1] and a[4], then passes it to the a.select_elements function.
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