I have a Javascript array, full_range:
const range1 = _.range(1, 10, 0.5);
const range2 = _.range(10, 100, 5);
const range3 = _.range(100, 1000, 50);
const range4 = _.range(1000, 10000, 500);
const range5 = _.range(10000, 105000, 5000);
const full_range = range1.concat(range2).concat(range3).concat(range4).concat(range5);
I then loop over this array and populate another array.
var transY= [];
var transX= [];
for(let i = 0; i < full_range.length; i++){
let y = getTrans(full_range[i], dampingFactor, natFreq); //returns a float
transY.push(y);
transX.push(parseFloat(full_range[i]));
}
The result is then returned to another function where:
console.log(transX); //Correct: Prints Array of 91 length (although the numbers with //decimals are at the end for some reason
console.log(transY); //Correct: Prints Array of 91 length
console.log("first");
console.log(transX[0]); //Correct: Prints 1
console.log("Last");
console.log(transX[-1]); //Incorrect: Prints "undefined instead of the last item
let xd = transX.pop();
console.log("xd:" + xd); //Works and correctly prints the last item in transX
The goal is to graph this dataset on a BokehJS graph, which does weird things when the last value is undefined.
Why is "undefined" being treated as an array element using slicing, but not when using pop()?
How would I be able to get the array without the undefined element?
Negative array indexing (with bracket notation) is not supported in JavaScript. However, you can use Array#at with negative indexes.
let arr = [1,2,3];
console.log(arr[-1]); // wrong
console.log(arr.at(-1)); // get last element