JavaScript: Print all the methods in an JavaScript object

JavaScript Object: Exercise-11 with Solution

Write a JavaScript function to print all the methods in an JavaScript object.
Test Data:
["length", "name", "arguments", "caller", "prototype", "isArray", "observe", "unobserve"]

Sample Solution: -

HTML Code:

<!DOCTYPE html>
  <meta charset="utf-8">
  <title>JavaScript function to display all methods in a object.</title>


JavaScript Code:

function FindAllMethods(obj) {
    return Object.getOwnPropertyNames(obj).filter(function(property) {
        return typeof obj[property] == "function";
//above code finds methods only
//Following code finds both properties and methods 
function all_properties(obj) 
 return Object.getOwnPropertyNames(obj);



Sample Output:

["abs", "acos", "acosh", "asin", "asinh", "atan", "atanh", "atan2", "ceil", "cbrt", "expm1", "clz32", "cos", "cosh", "exp", "floor", "fround", "hypot", "imul", "log", "log1p", "log2", "log10", "max", "min", "pow", "random", "round", "sign", "sin", "sinh", "sqrt", "tan", "tanh", "trunc"]
["isArray", "from", "of"]
["abs", "acos", "acosh", "asin", "asinh", "atan", "atanh", "atan2", "ceil", "cbrt", "expm1", "clz32", "cos", "cosh", "exp", "floor", "fround", "hypot", "imul", "log", "log1p", "log2", "log10", "max", "min", "pow", "random", "round", "sign", "sin", "sinh", "sqrt", "tan", "tanh", "trunc", "E", "LN10", "LN2", "LOG10E", "LOG2E", "PI", "SQRT1_2", "SQRT2"]
["length", "name", "prototype", "isArray", "from", "of"]


Flowchart: JavaScript - Print all the methods in an JavaScript object.

Live Demo:

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JavaScript: Tips of the Day


class Calc {
	constructor() {
		this.count = 0 

	increase() {
		this.count ++

const calc = new Calc()
new Calc().increase()


We set the variable calc equal to a new instance of the Calc class. Then, we instantiate a new instance of Calc, and invoke the increase method on this instance. Since the count property is within the constructor of the Calc class, the count property is not shared on the prototype of Calc. This means that the value of count has not been updated for the instance calc points to, count is still 0.

Ref: https://bit.ly/2Hcpkm6