La función ordinal.copy() se usa para crear y devolver la copia exacta de la escala ordinal. Cualquier cambio en la escala original no afectará la escala de la copia y viceversa.
Sintaxis:
ordinal.copy();
Parámetros: Este método no toma ningún parámetro.
Valores devueltos: este método devuelve una copia de la escala original.
Ejemplo 1:
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" path1tent=
"width=device-width,
initial-scale = 1.0" />
<script src=
"https://d3js.org/d3.v4.min.js">
</script>
</head>
<body>
<script>
// Creating the Ordinal scale.
var ordinal = d3.scaleThreshold()
// Setting domain for the scale
.domain([1, 2, 3, 4])
.range([10, 20, 30, 40]);
// Making copy of the scale.
var ordinalCopy = ordinal.copy();
console.log("The value of ordinalCopy(1) is: ",
ordinalCopy(1));
console.log("The value of ordinalCopy(2) is: ",
ordinalCopy(2));
console.log("The value of ordinal(1) is: ",
ordinal(1));
console.log("The value of ordinal(2) is: ",
ordinal(2));
</script>
</body>
</html>
Producción:
Ejemplo 2:
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" path1tent=
"width=device-width,
initial-scale = 1.0" />
<script src=
"https://d3js.org/d3.v4.min.js">
</script>
</head>
<body>
<script>
// Creating the Ordinal scale.
var ordinal = d3.scaleThreshold()
// Setting domain for the scale
.domain([1, 2, 3, 4])
.range([10, 20, 30, 40, 50]);
console.log("The value of ordinal(3) is: ",
ordinal(3));
console.log("The value of ordinal(4) is: ",
ordinal(4));
// Making copy of the scale.
var ordinalCopy = ordinal.copy();
// making change in the original scale.
ordinal.range(["The range of the "
+ "original scale is change"]);
console.log("The value of ordinalCopy(3) is: ",
ordinalCopy(3));
console.log("The value of ordinalCopy(4) is: ",
ordinalCopy(4));
console.log("The value of ordinal(3) is: ",
ordinal(3));
console.log("The value of ordinal(4) is: ",
ordinal(4));
</script>
</body>
</html>
Producción:
