How to use the d3-format.precisionRound function in d3-format
To help you get started, we’ve selected a few d3-format examples, based on popular ways it is used in public projects.
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DefinitelyTyped / DefinitelyTyped / types / d3-format / d3-format-tests.ts View on Github 
let width: number | undefined = specifier.width;
let comma: boolean = specifier.comma;
let precision: number = specifier.precision;
let type: 'e' | 'f' | 'g' | 'r' | 's' | '%' | 'p' | 'b' | 'o' | 'd' | 'x' | 'X' | 'c' | '' | 'n' = specifier.type;
let formatString: string = specifier.toString();
// ----------------------------------------------------------------------
// Test Precision Suggestors
// ----------------------------------------------------------------------
num = d3Format.precisionFixed(0.0005);
num = d3Format.precisionPrefix(0.0005, 1000);
num = d3Format.precisionRound(0.0005, 3000);
// ----------------------------------------------------------------------
// Test Locale Definition
// ----------------------------------------------------------------------
localeDef = {
decimal: ',',
thousands: '.',
grouping: [3],
currency: ['EUR', '']
};
localeDef = {
decimal: "\u066b",
thousands: "\u066c",
grouping: [3],let comma: boolean = specifier.comma;
let precision: number = specifier.precision;
let type: 'e' | 'f' | 'g' | 'r' | 's' | '%' | 'p' | 'b' | 'o' | 'd' | 'x' | 'X' | 'c' | '' | 'n' = specifier.type;
let formatString: string = specifier.toString();
// ----------------------------------------------------------------------
// Test Precision Suggestors
// ----------------------------------------------------------------------
num = d3Format.precisionFixed(0.0005);
num = d3Format.precisionPrefix(0.0005, 1000);
num = d3Format.precisionRound(0.0005, 3000);
// ----------------------------------------------------------------------
// Test Locale Definition
// ----------------------------------------------------------------------
localeDef = {
decimal: ',',
thousands: '.',
grouping: [3],
currency: ['EUR', '']
};
localeDef = {
decimal: "\u066b",
thousands: "\u066c",
grouping: [3],export default function(start, stop, count, specifier) {
var step = tickStep(start, stop, count),
precision;
specifier = formatSpecifier(specifier == null ? ",f" : specifier);
switch (specifier.type) {
case "s": {
var value = Math.max(Math.abs(start), Math.abs(stop));
if (specifier.precision == null && !isNaN(precision = precisionPrefix(step, value))) specifier.precision = precision;
return formatPrefix(specifier, value);
}
case "":
case "e":
case "g":
case "p":
case "r": {
if (specifier.precision == null && !isNaN(precision = precisionRound(step, Math.max(Math.abs(start), Math.abs(stop))))) specifier.precision = precision - (specifier.type === "e");
break;
}
case "f":
case "%": {
if (specifier.precision == null && !isNaN(precision = precisionFixed(step))) specifier.precision = precision - (specifier.type === "%") * 2;
break;
}
}
return format(specifier);
}var range = linearRange(domain, count);
if (f == null) f = ',f';
switch (f = d3_numberF.formatSpecifier(f), f.type) {
case 's': {
var value = Math.max(Math.abs(range[0]), Math.abs(range[1]));
if (f.precision == null) f.precision = d3_numberF.precisionPrefix(range[2], value);
return numberF.formatPrefix(f, value);
}
case '':
case 'e':
case 'g':
case 'p':
case 'r': {
if (f.precision == null) f.precision = d3_numberF.precisionRound(range[2], Math.max(Math.abs(range[0]), Math.abs(range[1]))) - (f.type === 'e');
break;
}
case 'f':
case '%': {
if (f.precision == null) f.precision = d3_numberF.precisionFixed(range[2]) - 2 * (f.type === '%');
break;
}
}
return numberF.format(f);
}
