numbers – Page 25 – Tarik Billa

How can I extract a number from a string in JavaScript?

September 14, 2022 by Tarik

For this specific example, var thenum = thestring.replace( /^\D+/g, ”); // replace all leading non-digits with nothing in the general case: thenum = “foo3bar5”.match(/\d+/)[0] // “3” Since this answer gained popularity for some reason, here’s a bonus: regex generator. function getre(str, num) { if(str === num) return ‘nice try’; var res = [/^\D+/g,/\D+$/g,/^\D+|\D+$/g,/\D+/g,/\D.*/g, /.*\D/g,/^\D+|\D.*$/g,/.*\D(?=\d)|\D+$/g]; for(var … Read more

Java – Convert integer to string [duplicate]

September 13, 2022 by Tarik

There are multiple ways: String.valueOf(number) (my preference) “” + number (I don’t know how the compiler handles it, perhaps it is as efficient as the above) Integer.toString(number)

How to zero pad a sequence of integers in bash so that all have the same width?

September 12, 2022 by Tarik

In your specific case though it’s probably easiest to use the -f flag to seq to get it to format the numbers as it outputs the list. For example: for i in $(seq -f “%05g” 10 15) do echo $i done will produce the following output: 00010 00011 00012 00013 00014 00015 More generally, bash … Read more

How to extract numbers from a string in Python?

September 10, 2022 by Tarik

If you only want to extract only positive integers, try the following: >>> txt = “h3110 23 cat 444.4 rabbit 11 2 dog” >>> [int(s) for s in txt.split() if s.isdigit()] [23, 11, 2] I would argue that this is better than the regex example because you don’t need another module and it’s more readable … Read more

What’s the best way to convert a number to a string in JavaScript?

September 9, 2022 by Tarik

like this: var foo = 45; var bar=”” + foo; Actually, even though I typically do it like this for simple convenience, over 1,000s of iterations it appears for raw speed there is an advantage for .toString() See Performance tests here (not by me, but found when I went to write my own): http://jsben.ch/#/ghQYR Fastest … Read more

Show a number to two decimal places

September 8, 2022 by Tarik

You can use number_format(): return number_format((float)$number, 2, ‘.’, ”); Example: $foo = “105”; echo number_format((float)$foo, 2, ‘.’, ”); // Outputs -> 105.00 This function returns a string.

Formatting a number with leading zeros in PHP [duplicate]

September 8, 2022 by Tarik

Use sprintf : sprintf(‘%08d’, 1234567); Alternatively you can also use str_pad: str_pad($value, 8, ‘0’, STR_PAD_LEFT);

How do I check that a number is float or integer?

September 7, 2022 by Tarik

check for a remainder when dividing by 1: function isInt(n) { return n % 1 === 0; } If you don’t know that the argument is a number you need two tests: function isInt(n){ return Number(n) === n && n % 1 === 0; } function isFloat(n){ return Number(n) === n && n % 1 … Read more

Can I hide the HTML5 number input’s spin box?

August 30, 2022 by Tarik

This CSS effectively hides the spin-button for webkit browsers (have tested it in Chrome 7.0.517.44 and Safari Version 5.0.2 (6533.18.5)): input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { /* display: none; <- Crashes Chrome on hover */ -webkit-appearance: none; margin: 0; /* <– Apparently some margin are still there even though it’s hidden */ } input[type=number] { -moz-appearance:textfield; /* Firefox … Read more

How to sort an array of integers correctly

August 30, 2022 by Tarik

By default, the sort method sorts elements alphabetically. To sort numerically just add a new method which handles numeric sorts (sortNumber, shown below) – var numArray = [140000, 104, 99]; numArray.sort(function(a, b) { if( a === Infinity ) return 1; else if( isNaN(a)) return -1; else return a – b; }); console.log(numArray); Documentation: Mozilla Array.prototype.sort() … Read more