Drawing a line that is an element of an array in p5.js - p5.js

Question

In my current p5.js project, I'm randomly plotting several lines on the canvas - so my background is in the setup function, but I wish to highlight the current one with a thicker stroke. In order to know which line was the last one drawn, I'm pushing them to a list to redraw just the last one later with a different stroke value. But I don't know how to display on the canvas such a line that is an element of an array. Somebody could help me?
What I have done so far:
//just inicializing the x-coordinates of the limit point of my line
let ax = 0;
let bx = 0;
//variables for the current line and the array of lines
let linha;
let linhas = [];
function setup() {
createCanvas(400, 400);
background(0);
}
function draw() {
//randomly choosing the x-coordinates of the limit point of my line
ax = random(0,400);
bx = random(0, 400);
stroke(255, 50)
//plotting the current line
linha = line(ax, 0, bx, 400);
//putting it on the array
linhas.push(line);
//what I wish to be doing is something like
/*
strokeWeight(5);
'print' linhas(linhas.length - 1) //where by print I mean display on the screen the last of the lines and only it, i.e. in the n+1 iteration, I don't want to have the n-line with that thicker stroke.
*/
}

Answer 1

Something like below will help. I've added comments on the relevant lines.
//just saving the indices for better readibility and to make it less bug-prone.
const x = 0,
start = 0,
y = 1,
end = 1;
const myLines = [];
function setup() {
createCanvas(400, 400);
//move the entire codeblock below to draw() if you randomize it on every render.
//add your random lines as such
myLines.push([[10, 20],[30, 40]]);
myLines.push([[20, 20],[20, 60]]);
myLines.push([[30, 20],[10, 300]]);
myLines.push([[40, 20],[100, 120]]);
myLines.push([[50, 20],[40, 80]]);
background(220);
//drawing the lines from the array
for (let i = 0; i < myLines.length; i++) {
line(
myLines[i][start][x],
myLines[i][start][y],
myLines[i][end][x],
myLines[i][end][y]
);
}
//getting the last element in the array to draw a thicker line
strokeWeight(5);
line(
myLines[myLines.length - 1][start][x],
myLines[myLines.length - 1][start][y],
myLines[myLines.length - 1][end][x],
myLines[myLines.length - 1][end][y]
);
}