Percent control done right

Percent is a npm module which gives you nice options to control percentages. It's like semver for percentages.

$ npm install percent

Calculate percentage

const percent = require('percent');

console.log(percent.calc(5, 20, 0)); // => 25

Validate percentage

const percent = require('percent');

if (percent.valid(5)) { // => true
  console.log('5 is a valid percent value');
}

Compare percentages

const percent = require('percent');

if (percent.lt('5%', 6)) { // => true
  console.log('a is smaller than b');
}

const percent = require('percent');

Usage: percent.calc(value, total, decimal, [sign])
Example: percent.calc(5, 20, 0)

Calculates percentage from the given number (value) and total number (total) with specified number of decimals (decimal).

sign may be boolean which turns percent sign (%) addition. Returns percent value with percent sign if sign is true (it's false by default). If sign is string, it will be used as value suffix.

Usage: percent.re

Returns supreme percent regexp.

Usage: percent.valid(value)
Example: percent.valid('5%')

Checks if value is valid percent value. It is valid if it's a number, number-like string (e.g. '10', not 10), or string with number and percent sign. Spaces are allowed in strings.

Usage: percent.sign(value)
Example: percent.sign(5)

Adds percent sign to value.

Usage: percent.unsign(value)
Example: percent.unsign('5%')

Removes percent sign(s) from value.

Usage: percent.clean(value)
Example: percent.clean(' 5 % ')

Removes percent sign(s) and spaces from value.

Usage: percent.convert(value, [negative])
Example: percent.convert(' 5 % ')

Converts percent-like string to number. Returns negative number if negative is true.

Usage: percent.lt(l, t)
Example: percent.lt('5%', 6)

Checks is the first argument smaller than second.

Usage: percent.gt(g, t)
Example: percent.gt('6%', 5)

Checks is the first argument greater than second.

Usage: percent.eq(e, q)
Example: percent.eq('5%', 5)

Checks are the arguments logically equal.

Usage: percent.neq(ne, q)
Example: percent.neq('6%', 5)

Checks are the arguments logically unequal.

Usage: percent.satisfies(value, min, max)
Example: percent.satisfies(5.5, 5, 6)

Checks does the value satisfy the given range. It will exchange min and max values if min is bigger than max.

MIT © Zlatan Vasović