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var NumericalRange = function() {

function linspace(start, stop, parts = 10) {

if (typeof(start) == "undefined" || typeof(stop) == "undefined") {

/**

* case like start is undefined and stop has some value is not possible in JavaScript

* such case is possible since during calling a function you can calling using following method

* linspace(stop=5). Such case is not possible in JS. JS will take the first parameter as

* start value only. Case such as both are both are undefined can occur so it is handle.

*

*/

if ((typeof(start) != "undefined") && (typeof(stop) == "undefined")) {

throw new Error(`linspace() missing 1 required positional argument: 'stop'`);

} else if ((typeof(start) == "undefined") && (typeof(stop) == "undefined")) {

throw new Error(`linspace() missing 2 required positional arguments: 'start' and 'stop'`);

} else {

throw new Error(`Some unknown Exception occured in linspace`);

}

}

if (start == stop) {

var toReturnData = [];

for (let i = 0; i < parts; i++) {

toReturnData[i] = start;

}

return toReturnData;

}

if (parts < 0) {

throw new Error(`Number of samples, ${parts}, must be non-negative.`);

} else if (parts == 0) {

return [];

} else if (parts == 1) {

return [start];

} else if (parts == 2) {

return [start, stop];

} else {

var increment = (stop * 1.0 - start * 1.0) / (parts - 1) * 1.0;

var toReturn = [];

var temp = start;

for (let i = 0; i < parts; i++) {

toReturn[i] = temp;

temp = temp + increment;

}

return toReturn;

}

}

function arange(start, stop, step = 1) {

if (typeof(stop) == "undefined") {

stop = start;

start = 0;

}

if (step <= 0) {

throw new Error(`Step cannot be negative or zero. Current step is ${step}`);

}

var toReturn = [];

var counter = -1;

for (let temp = start; temp <= stop; temp = temp + step) {

toReturn[++counter] = temp;

}

return toReturn;

}

return {

linspace: linspace,

arange: arange

}

}

module.exports = NumericalRange();