How to shorten JS code for SVG?

Question

SVG

I'm thinking of a schedule for the site, there is such an option:

https://jsfiddle.net/malkovan/ef83j1nw/317/

I do not want to use libraries yet, only on pure JS.
I met with a search some method that made it possible to reduce the entry to a single line
instead of instructing each attribute to make a separate line.
Tell me how?
Those. here it is to shorten it without using third party libraries:

let axis = document.createElementNS(svgNS, 'line');
axis.setAttribute('x1', 70);
axis.setAttribute('y1', 49.5);
axis.setAttribute('x2', 430);
axis.setAttribute('y2', 49.5);
axis.setAttribute('stroke', 'black');
axis.setAttribute('stroke-width', 1);
svg.appendChild(axis);

Well, according to the implementation, you can tell me what is wrong, otherwise I'm just starting to delve into it)
ps. I can’t insert a link to JSfiddle in any way, and in general it attaches a link, and after publication there is an empty space, what for?