Javascript: How cut out part of an integer?

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How to cut out part of an integer?

What can i do to get an integer 12 or 123 from a variable n

let n = 123456;

A simple way to do this would be to just cast the input number to a string, and then take a substring:

var n = 123456;
n = n + "";
var output = n.slice(0, 2);
console.log(output);

Javascript: How cut out part of an integer?, The floor() method rounds a number DOWNWARDS to the nearest integer, and returns the result. If the passed argument is an integer, the value will not be� The slice () method extracts parts of a string and returns the extracted parts in a new string. Use the start and end parameters to specify the part of the string you want to extract. The first character has the position 0, the second has position 1, and so on. Tip: Use a negative number to select from the end of the string.

The strategy I suggest is to convert the integer value to a string which you may manipulate with parseInt() as well as the string's substr() method, as follows:

const START       = 0;
const first_two   = 2;
const first_three = 3;
const base_ten    = 10;

let n = 123456;
let res = parseInt( String( n ).substr( START,first_two ),base_ten );
console.log(res);
res = parseInt(String( n ).substr( START,first_three ),base_ten );
console.log(res);

Math.trunc(), BigInt numbers, to represent integers of arbitrary length. They are These functions cover all of the possible ways to deal with the decimal part of a number. But what if Just round them to cut “tails” when needed. The funny� Optional. An integer that specifies where to start the selection (The first element has an index of 0). Use negative numbers to select from the end of an array. If omitted, it acts like "0" end: Optional. An integer that specifies where to end the selection. If omitted, all elements from the start position and to the end of the array will be

I think this will work for you - you first change it to string and split it to an array and then remove the unwanted characters, then join the array together, and parse it as an integer: (edited to reflect @VLAZ's comment.

parseInt(n.toString().slice(0,2)));

JavaScript floor() Method, round() will return a number rounded up to the nearest integer. const removedDecimal = Math.round(decimal); // returns 5. Using toFixed(). The� Thanks for pointing it out! I've always just used the substring method, but the ability to use negative indexes could definitely come in handy. There are probably cases where you might want any negative number to just be treated the same as 0, so the substring method could still be useful, though I don't have a particular use case in mind.

Numbers, Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML.

How to remove decimal places in JavaScript?, The LEFT function allows you to extract a given number of characters from the left of a given text string. The LEFT function requires two arguments: the text string you are evaluating and the number of characters you need extracted from the left of the text string. In the example, you extract the left five characters from the value in Cell A4.

either a numeric vector of two or more unique cut points or a single number (greater than or equal to 2) giving the number of intervals into which x is to be cut. labels. labels for the levels of the resulting category. By default, labels are constructed using "(a,b]" interval notation.

Comments
  • what is the condition here? need to cut off all the occurences of 12 or 123?
  • What is the logic of getting that part. Do you provide length to function 2 and 3 for 12 and 123 respectively.
  • Wait...it actually has a demo :P
  • We still do not know what the OP's required condition is
  • @MaheerAli You're right, I changed my answer. JavaScript is not my native language (it is English).
  • Thanks for your answer Tim!
  • Thanks for your answer!
  • You are correct, missed that one. Thank you - I already edited it.