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node_modules/mumath/precision.js

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+/**
+ * @module  mumath/precision
+ *
+ * Get precision from float:
+ *
+ * @example
+ * 1.1 → 1, 1234 → 0, .1234 → 4
+ *
+ * @param {number} n
+ *
+ * @return {number} decimap places
+ */
+'use strict';
+
+var almost = require('almost-equal');
+var norm = require('./normalize');
+
+module.exports = function (n, eps) {
+	n = norm(n);
+
+	var str = n + '';
+
+	//1e-10 etc
+	var e = str.indexOf('e-');
+	if (e >= 0) return parseInt(str.substring(e+2));
+
+	//imperfect ints, like 3.0000000000000004 or 1.9999999999999998
+	var remainder = Math.abs(n % 1);
+	var remStr = remainder + '';
+
+	if (almost(remainder, 1, eps) || almost(remainder, 0, eps)) return 0;
+
+	//usual floats like .0123
+	var d = remStr.indexOf('.') + 1;
+
+	if (d) return remStr.length - d;
+
+	//regular inte
+	return 0;
+};