numbers – Page 15 – Tarik Billa

Adding space between numbers

February 9, 2023 by Tarik

For integers use function numberWithSpaces(x) { return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ” “); } For floating point numbers you can use function numberWithSpaces(x) { var parts = x.toString().split(“.”); parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ” “); return parts.join(“.”); } This is a simple regex work. https://developer.mozilla.org/en-US/docs/JavaScript/Guide/Regular_Expressions << Find more about Regex here. If you are not sure about whether the number … Read more

Confusion between isNaN and Number.isNaN in javascript

February 8, 2023 by Tarik

To quote from a ponyfoo article on numbers in ES6: Number.isNaN is almost identical to ES5 global isNaN method. Number.isNaN returns whether the provided value equals NaN. This is a very different question from “is this not a number?”. So isNaN just checks whether the passed value is not a number or cannot be converted … Read more

Show a leading zero if a number is less than 10 [duplicate]

February 8, 2023 by Tarik

There’s no built-in JavaScript function to do this, but you can write your own fairly easily: function pad(n) { return (n < 10) ? (“0” + n) : n; } EDIT: Meanwhile there is a native JS function that does that. See String#padStart console.log(String(5).padStart(2, ‘0’));

Making all numbers negative

February 7, 2023 by Tarik

A trivial $num = $num <= 0 ? $num : -$num ; or, the better solution, IMHO: $num = -1 * abs($num) As @VegardLarsen has posted, the explicit multiplication can be avoided for shortness but I prefer readability over shortness I suggest to avoid if/else (or equivalent ternary operator) especially if you have to manipulate … Read more

Difference between 2 numbers

February 4, 2023 by Tarik

You can do it like this public decimal FindDifference(decimal nr1, decimal nr2) { return Math.Abs(nr1 – nr2); }

JavaScript adding decimal numbers issue [duplicate]

February 2, 2023 by Tarik

Use toFixed to convert it to a string with some decimal places shaved off, and then convert it back to a number. +(0.1 + 0.2).toFixed(12) // 0.3 It looks like IE’s toFixed has some weird behavior, so if you need to support IE something like this might be better: Math.round((0.1 + 0.2) * 1e12) / … Read more

Simplest way of getting the number of decimals in a number in JavaScript [duplicate]

February 1, 2023 by Tarik

Number.prototype.countDecimals = function () { if(Math.floor(this.valueOf()) === this.valueOf()) return 0; return this.toString().split(“.”)[1].length || 0; } When bound to the prototype, this allows you to get the decimal count (countDecimals();) directly from a number variable. E.G. var x = 23.453453453; x.countDecimals(); // 9 It works by converting the number to a string, splitting at the . … Read more

Checking if string is numeric in dart

February 1, 2023 by Tarik

This can be simpliefied a bit void main(args) { print(isNumeric(null)); print(isNumeric(”)); print(isNumeric(‘x’)); print(isNumeric(‘123x’)); print(isNumeric(‘123’)); print(isNumeric(‘+123’)); print(isNumeric(‘123.456’)); print(isNumeric(‘1,234.567’)); print(isNumeric(‘1.234,567’)); print(isNumeric(‘-123’)); print(isNumeric(‘INFINITY’)); print(isNumeric(double.INFINITY.toString())); // ‘Infinity’ print(isNumeric(double.NAN.toString())); print(isNumeric(‘0x123’)); } bool isNumeric(String s) { if(s == null) { return false; } return double.parse(s, (e) => null) != null; } false // null false // ” false // ‘x’ false … Read more

Why does JavaScript handle the plus and minus operators between strings and numbers differently?

January 29, 2023 by Tarik

String concatenation is done with + so Javascript will convert the first numeric 1 to a string and concatenate “1” and “1” making “11”. You cannot perform subtraction on strings, so Javascript converts the second “1” to a number and subtracts 1 from 1, resulting in zero.

php random x digit number

January 28, 2023 by Tarik

You can use rand() together with pow() to make this happen: $digits = 3; echo rand(pow(10, $digits-1), pow(10, $digits)-1); This will output a number between 100 and 999. This because 10^2 = 100 and 10^3 = 1000 and then you need to subtract it with one to get it in the desired range. If 005 … Read more