refactor: move some methods to utils

Author: Marco Cesarato

index.js

@@ -2,6 +2,7 @@ import React, {Component} from "react";
 import {Text, TextInput, TouchableHighlight, View} from "react-native";
 import PropTypes from "prop-types";
 import {Style} from "./style";
+import {isEmpty, isStringEmpty, debounce} from "./utils";
 
 /**
  * Default Color
@@ -95,7 +96,7 @@ class InputSpinner extends Component {
 	onChange(num) {
 		if (this.props.disabled) return;
 		const current_value = this.state.value;
-		const separator = !this.isStringEmpty(this.props.decimalSeparator)
+		const separator = !isEmpty(this.props.decimalSeparator)
 			? this.props.decimalSeparator
 			: ".";
 		if (
@@ -159,7 +160,6 @@ class InputSpinner extends Component {
 		return num;
 	}
 
-
 	/**
 	 * Limit value to be within max and min range
 	 * @param value
@@ -190,7 +190,7 @@ class InputSpinner extends Component {
 	 */
 	parseNum(num) {
 		num = String(num).replace(
-			!this.isStringEmpty(this.props.decimalSeparator)
+			!isEmpty(this.props.decimalSeparator)
 				? this.props.decimalSeparator
 				: ".",
 			"."
@@ -225,13 +225,15 @@ class InputSpinner extends Component {
 		} else {
 			value = String(this.parseNum(value));
 		}
-		let hasPlaceholder = value === "0" && !this.isStringEmpty(this.props.placeholder);
-		return hasPlaceholder ? "" : value.replace(
-			".",
-			!this.isStringEmpty(this.props.decimalSeparator)
-				? this.props.decimalSeparator
-				: "."
-		);
+		let hasPlaceholder = value === "0" && !isEmpty(this.props.placeholder);
+		return hasPlaceholder
+			? ""
+			: value.replace(
+					".",
+					!isEmpty(this.props.decimalSeparator)
+						? this.props.decimalSeparator
+						: "."
+			  );
 	}
 
 	/**
@@ -391,24 +393,6 @@ class InputSpinner extends Component {
 		this.textInput.clear();
 	}
 
-	/**
-	 * Is object empty
-	 * @param obj
-	 * @returns {boolean}
-	 */
-	isObjectEmpty(obj) {
-		return Object.entries(obj).length === 0 && obj.constructor === Object;
-	}
-
-	/**
-	 * Is string empty
-	 * @param str
-	 * @returns {boolean|boolean}
-	 */
-	isStringEmpty(str) {
-		return !str || String(str) === "";
-	}
-
 	/**
 	 * Is text input editable
 	 * @returns {boolean|Boolean}
@@ -625,7 +609,7 @@ class InputSpinner extends Component {
 	 * @private
 	 */
 	_getStyleButtonPress() {
-		return this.isObjectEmpty(this.props.buttonPressStyle)
+		return isEmpty(this.props.buttonPressStyle)
 			? this.props.buttonStyle
 			: this.props.buttonPressStyle;
 	}
@@ -803,7 +787,9 @@ class InputSpinner extends Component {
 	 */
 	render() {
 		return (
-			<View style={this._getContainerStyle()} {...this.props.containerProps}>
+			<View
+				style={this._getContainerStyle()}
+				{...this.props.containerProps}>
 				{this._renderLeftButton()}
 
 				{this.props.prepend}

utils.js

@@ -0,0 +1,57 @@
+/**
+ * Is string empty
+ * @param str
+ * @returns {boolean|boolean}
+ */
+export const isStringEmpty = (str) => {
+	return String(str) === "";
+};
+
+/**
+ * Is empty
+ * @param x
+ * @returns {boolean}
+ */
+export const isEmpty = (x) => {
+	if (typeof x === typeof "") x = x.replace(/\s/g, "");
+
+	if (!x) return true;
+	if (x === "") return true;
+	if (x === {}) return true;
+	if (x === []) return true;
+	if (x == null) return true;
+	if (typeof x === "undefined") return true;
+	if (x === "") return true;
+	if (x === function () {}) return true;
+
+	if (typeof x === typeof {}) {
+		if (Object.entries(x).length === 0 && x.constructor === Object) {
+			return true;
+		}
+		for (let key in x) {
+			if (x.hasOwnProperty(key) && !isEmpty(x[key])) {
+				return false;
+			}
+		}
+		return true;
+	}
+	return false;
+};
+
+/**
+ * Debounce
+ * @param callback
+ * @param wait
+ * @param context
+ * @returns {function(...[*]=): void}
+ */
+export const debounce = (callback, wait, context = null) => {
+	let timeout;
+	return (...args) => {
+		if (context === null) {
+			context = this;
+		}
+		clearTimeout(timeout);
+		timeout = setTimeout(() => callback.apply(context, args), wait);
+	};
+};