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hitarthpathakhitarthpathak
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Update 03_typeof.js and Add 09_Date_And_Time.js.
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Lines changed: 100 additions & 2 deletions

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‎03_typeof.js‎

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console.log(typeof "Hello"); // "string"
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console.log(typeof String); // "function"
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console.log(typeof String()); // "string"
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console.log(typeof String("Hello")); // "string"
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console.log(typeof 123); // "number"
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console.log(typeof Number); // "function"
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console.log(typeof Number()); // "number"
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console.log(typeof Number(123)); // "number"
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console.log(typeof true); // "boolean"
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console.log(typeof Boolean); // "function"
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console.log(typeof Boolean()); // "boolean"
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console.log(typeof Boolean(true)); // "boolean"
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console.log(typeof null); // "object" (historical bug in JavaScript)
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console.log(typeof undefined); // "undefined"
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console.log(typeof Symbol); // "function"
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console.log(typeof Symbol()); // "symbol"
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console.log(typeof Symbol("id")); // "symbol"
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console.log(typeof Symbol(123)); // "symbol"
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console.log(typeof BigInt); // "function"
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console.log(typeof BigInt()); // TypeError - Cannot convert undefined to BigInt
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console.log(typeof BigInt("123")); // "bigint"
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console.log(typeof BigInt(123)); // "bigint"
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console.log(typeof { name: "Hitarth", age: 24, single: true }); // "object"
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console.log(typeof Object); // "function"
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console.log(typeof Object()); // "object"
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console.log(typeof Object({ name: "Hitarth", age: 24, single: true })); // "object"
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console.log(typeof [1, 2, 3]); // "object"
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console.log(typeof Array); // "function"
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console.log(typeof Array()); // "object"
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console.log(typeof Array(1, 2, 3)); // "object"
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console.log(typeof function () { }); // "function" (special case - bacause they are callable objects)
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console.log(typeof Function); // "function"
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console.log(typeof Function()); // "function"
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console.log(typeof Function(() => { })); // "function"
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console.log(typeof Date); // "function"
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console.log(typeof Date()); // "string"
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console.log(typeof new Date()); // "object"
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console.log(typeof RegExp); // "function"
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console.log(typeof RegExp()); // "object"
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console.log(typeof Map); // "function"
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console.log(typeof Map()); // TypeError - Constructor Map requires 'new'
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console.log(typeof new Map()); // "object"
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console.log(typeof Set); // "function"
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console.log(typeof Set()); // TypeError - Constructor Set requires 'new'
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console.log(typeof new Set()); // "object"
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console.log(typeof Error); // "function"
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console.log(typeof Error()); // "object"
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console.log(typeof Math); // "object"
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console.log(typeof JSON); // "object"
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console.log(typeof Promise); // "function"
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console.log(typeof Promise()); // TypeError - Constructor Promise cannot be invoked without 'new'
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console.log(typeof new Promise()); // TypeError - Promise Resolver undefined is not a Function
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console.log(typeof new Promise(() => { })); // "object"
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‎08_Math.js‎

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// Math Properties :-
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// MATH PROPERTIES :-
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// .PI - return the value of PI
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console.log(Math.PI); // "3.141592653589793"
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// Math Methods :-
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// MATH METHODS :-
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// .abs() - return the absolute (positive) value
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console.log(Math.abs(3)); // "3"

‎09_Date_And_Time.js‎

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// THE STANDARD DATE : January 1, 1970, UTC
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// ------------------------------------------------------------------------------------------------
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console.log(Date()); // "Wed Jul 01 2026 19:16:37 GMT+0530 (India Standard Time)" (current date and time in local format)
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let current_date = new Date();
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console.log(current_date); // "2026-07-01T13:47:08.154Z" (current date and time in UTC format)
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let current_time = Date.now();
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console.log(current_time); // "1782913964468" (current timestamp in milliseconds since January 1, 1970, UTC)
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// ------------------------------------------------------------------------------------------------
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// DATE METHODS :-
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console.log(current_date.getDate()); // "1" (returns the day of the month (from 1-31))
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console.log(current_date.getDay()); // "3" (returns the day of the week (from 0-6) - 0: Sunday, 1: Monday, 2: Tuesday, 3: Wednesday, 4: Thursday, 5: Friday, 6: Saturday)
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console.log(current_date.getMonth()); // "6" (returns the month (from 0-11) - 0: January, 1: February, 2: March, 3: April, 4: May, 5: June, 6: July, 7: August, 8: September, 9: October, 10: November, 11: December)
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console.log(current_date.getFullYear()); // "2026" (returns the year (four digits))
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console.log(current_date.getTime()); // "1782913964468" (returns the number of milliseconds since January 1, 1970, UTC)
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console.log(current_date.getMilliseconds()); // "763" (returns the milliseconds (from 0-999))
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console.log(current_date.getSeconds()); // "30" (returns the seconds (from 0-59))
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console.log(current_date.getMinutes()); // "23" (returns the minutes (from 0-59))
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console.log(current_date.getHours()); // "19" (returns the hours (from 0-23))
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console.log(current_date.toDateString()); // "Wed Jul 01 2026" (returns the date in a human-readable format)
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console.log(current_date.toTimeString()); // "19:26:29 GMT+0530 (India Standard Time)" (returns the time in a human-readable format)
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console.log(current_date.toLocaleString()); // "7/1/2026, 7:28:09 PM" (returns the date and time in a human-readable format based on the locale)
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console.log(current_date.toLocaleDateString()); // "7/1/2026" (returns the date in a human-readable format based on the locale)
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console.log(current_date.toLocaleTimeString()); // "7:27:05 PM" (returns the time in a human-readable format based on the locale)

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