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round-number-cli
Advanced tools
JavaScript does some very crazy things with rounding.
TL,DR; Use the default method to round sanely and get back a 2-decimal place string.
Most of us were taught in school to use the 'round half up' method, like so:
Round 3.14159 to 1 decimal place
=> 3.1
Round 3.14159 to 2 decimal places
=> 3.14
Round 3.14159 to 3 decimal places
=> 3.142
Round 3.14159 to 4 decimal places
=> 3.1416
If you are rounding to 'x' places, and the digit in the 'x+1' position is equal to or greater than 5, round the 'x-th' digit up. Otherwise just drop the extra decimal places.
This module helps you do just that. It also provides more granular methods if you prefer a different rounding strategy.
npm install simple-round
simple-round
can return your rounded number as either a number
or string
, depending on which method you pick.
The default method both rounds half-up to 2 decimal places and returns the result as a string, formatted to 2 decimal places. This is different than using JavaScript's Number.toFixed()
method, which sometimes rounds up and sometimes rounds down (?), or Math.round()
, which does things you might not expect, including returning your result in scientific notation, because...?
The {braces}
are required in the require
:
const {fixedSimpleRound} = require('simple-round');
expect(fixedSimpleRound(3.14159)).toEqual('3.14');
Need more control? Yes, the {braces}
are required, in both the require
and the method call:
Params:
precision
(non-negative)number
direction
(from the set below)const {fixedRound, DIRECTIONS} = require('simple-round');
let number = 0.9999;
let direction = DIRECTIONS.DOWN;
let precision = 3;
expect(fixedRound({number, direction, precision})).toEqual('0.999');
let direction = DIRECTIONS.UP;
expect(fixedRound({number, direction, precision})).toEqual("1.000");
Default behavior for fixedRound
is rounding half-up, to 2 decimal places. Omit either or both of those arguments if that's OK with you.
These two methods return your result as a number. The rounding will be correct, but leading or trailing zeros might be dropped.
Supply the number
argument. Rounds HALF_UP to 2 decimal places:
const {simpleRound} = require('simple-round');
expect(simpleRound(3.14159)).toEqual(3.14);
expect(simpleRound(2.345)).toEqual(2.35);
expect(simpleRound(0.999)).toEqual(1.00);
expect(simpleRound(0.285)).toEqual(0.29);
Params as above. Yes, the {braces}
are required, in both the require
and the method call:
const {round, DIRECTIONS} = require('simple-round');
/*
DIRECTIONS.UP
DIRECTIONS.DOWN
DIRECTIONS.HALF_UP
DIRECTIONS.HALF_DOWN
*/
let number = 3.14159;
let direction = DIRECTIONS.DOWN;
let precision = 3;
expect(round({number, direction, precision})).toEqual(3.141);
let direction = DIRECTIONS.UP;
expect(round({number, direction, precision})).toEqual(3.142);
let direction = DIRECTIONS.HALF_UP;
expect(round({number, direction, precision})).toEqual(3.142);
let direction = DIRECTIONS.HALF_DOWN;
expect(round({number, direction, precision})).toEqual(3.141);
Default behavior for round()
is to round HALF_UP to 2 decimal places. Omit either or both of those arguments if that's OK with you.
npm run test
FAQs
round number algorithm
We found that round-number-cli demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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