@berriz44/mathext

mathext

mathext is an extension of the math interface in JavaScript.

how to install:

npm install @berriz44/mathext

usage:

const MathExt = require('@berriz44/mathext')

items

MathExt.numberRow: number | string | Array<number>

description:

makes a row of numbers

arguments:

1. end: number | to what number should it count
2. start: number | what number should it start with. defaults to 1.
3. step: number | how much to increment each number. defaults to 1. affected by start and end.
4. datatype: number | string | Array<any> | can be any number, array or string. defaults to array. determines the return type of the function.

returns:

a number, string, or Array<number> representing a row of numbers

examples:

MathExt.numberRow(10, 1)
// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
typeof MathExt.numberRow(10, 1)
/// Array<number>

MathExt.numberRow(11, 1, 2)
// [1, 3, 5, 7, 9, 11]

MathExt.numberRow(10, 1, 1, "")
// "12345678910"
typeof MathExt.numberRow(10, 1, 1, "")
// 'string'

MathExt.numberRow(10, 1, 1, 0)
// 12345678910
typeof MathExt.numberRow(10, 1, 1, 0)
// 'number'

MathExt.isPositive: boolean

description:

says if a number is positive or not

arguments:

i: number | which number to know whether it is positive or negative

returns:

true if i is positive, false if i is negative

examples:

MathExt.isPositive(77)
// true

MathExt.isPositive(-24)
// false

examples:

MathExt.infinity: number

description:

returns infinity or negative infinity based on a parameter

arguments:

side: number | any number. affects the return value.

returns:

infinity if side is a positive number and -infinity if side is a negative number

examples:

MathExt.infinity(1)
// Infinity

MathExt.infinity(-1)
// -Infinity

MathExt.turnStringArrayToNumberArray: Array<number>

description:

turns a string array into a number array

arguments:

arr: Array<string> | the array to convert

returns:

an Array<number> with numbers from the arr parameter

examples:

MathExt.turnStringArrayToNumberArray(["10", "4", "9", "fffg"])
// [10, 4, 9, NaN]