3e:null 3f:["$","title",null,{"children":"Nivelatorio Javascript David Galvis | David Galvis | Observable"}] 45:T60e,En esta última celda, se está definiendo un campo de movimiento de 300 unidades de ancho y 100 de altura, adicional un radio de 30.

Con la biblioteca d3 se está creando una variable de espacio svg con las características de altura y ancho, y luego sobre el svg se está utilizando el atributo append, que en programación usualmente refiere a agregar dentro, se está creando un circulo con características de radio, declaradas anteriormente, y las posiciones iniciales dentro del svg que son cx y cy.

Luego se está cambiando el valor de la posición inicial del círculo en el eje x hacia 300, y dentro de un "while(true)" que es un loop infinito, el yield y svg.node se encargan de conservar y guardar los valores y representarlos. Adicional se está añadiendo un delay de 2000 milisegundos dentro del loop para pasar a la siguiente línea.

Finalmente, se usa un operador ternario que trabaja sobre la condición:

cx == r ? cx = width - r : cx = r;

Indicando que si la posición en x es igual al radio, entonces la nueva posición del círculo en x 'cx' será igual al ancho menos el radio, haciendo desplazar el circulo hasta el extremo derecho, y si no lo es, entonces que la posición del círculo en x 'cx' vuelva a ser del valor del radio. Se suaviza el movmiento de la transición en 1500ms, donde tomará el nuevo valor de cx, hasta que vuelva a entrar al loop e inicio del while.

Que escrito de otra manera expresa:
if(cx==r){
cx = width - r
} else {
cx = r }
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