JavaScript: List the properties of a JavaScript object
Last update on February 26 2020 08:09:06 [UTC/GMT +8 hours]JavaScript Object: Exercise-1 with Solution
Write a JavaScript program to list the properties of a JavaScript object.
Sample object:
var student = {
name : "David Rayy",
sclass : "VI",
rollno : 12 };
Sample Output: name,sclass,rollno
Sample Solution: -
HTML Code:
JavaScript program to list the properties of a JavaScript object.JavaScript Code:
function _keys[obj] { if [!isObject[obj]] return []; if [Object.keys] return Object.keys[obj]; var keys = []; for [var key in obj] if [_.has[obj, key]] keys.push[key]; return keys; } function isObject[obj] { var type = typeof obj; return type === 'function' || type === 'object' && !!obj; } console.log[_keys[{red: "#FF0000", green: "#00FF00", white: "#FFFFFF"}]];Sample Output:
Flowchart:
Live Demo:
See the Pen javascript-object-exercise-1 by w3resource [@w3resource] on CodePen.
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Next: Write a JavaScript program to delete the rollno property from the following object. Also print the object before or after deleting the property.
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JavaScript: Tips of the Day
Merge/flatten your arrays in arrays
There's a nice method for Array called Array.flat, as an argument it needs depth you need to flat [default: 1]. But what if you don't know the depth, you need to flatten it all. We just put Infinity as the argument. Also there's a nice flatMap method.
const arrays = [[10], 50, [100, [2000, 3000, [40000]]]]; arrays.flat[Infinity]; // [ 10, 50, 100, 2000, 3000, 40000 ]Ref: //bit.ly/3o5iTBb
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