How to manipulate inputs
This tutorials helps you to create a simple formula, in this case, it will sum two positive numbers.
rit math sum numbers.Inputs
This formula must have (at least) two input parameters. See below:
- Number one (
RIT_NUMBER_ONE). - Number two (
RIT_NUMBER_TWO).
How can you do that?
Search for the config.json file of your formula and replace it the inputs field for the block below:
{
"label": "Number one : ",
"name": "rit_number_one",
"type": "text"
},
{
"label": "Number two : ",
"name": "rit_number_two",
"type": "text"
}
]
Step by step
Follow the steps below to create your formula:
Step 1: Extract all inputs parameters
Search for the main file of tour formula and extract all the inputs before using them to call your formula’s method. See some code example below:
import os
from formula import formula
number_one = int(os.environ.get("RIT_NUMBER_ONE"))
number_two = int(os.environ.get("RIT_NUMBER_TWO"))
formula.run(number_one, number_two)
package com.ritchie;
import com.ritchie.formula.Formula;
public class Main {
public static void main(String[] args) {
String numberOne = System.getenv("RIT_NUMBER_ONE");
String numberTwo = System.getenv("RIT_NUMBER_TWO");
Formula formula = new Formula(Integer.valueOf(numberOne), Integer.valueOf(numberTwo));
System.out.println(formula.run());
}
}
package main
import (
"formula/pkg/formula"
"os"
"strconv"
)
func main() {
numberOne, _ := strconv.Atoi(os.Getenv("RIT_NUMBER_ONE"))
numberTwo, _ := strconv.Atoi(os.Getenv("RIT_NUMBER_TWO"))
formula.Formula{
NumberOne: numberOne,
NumberTwo: numberTwo,
}.Run()
}
const run = require("./formula/formula")
const NUMBER_ONE = parseInt(process.env.RIT_NUMBER_ONE)
const NUMBER_TWO = parseInt(process.env.RIT_NUMBER_TWO)
run(NUMBER_ONE, NUMBER_TWO)
Warning: Here is where the conversion from STRING to INT happens, because there is no native INT type in the config.json file.
main.* nomenclature for most languages, except Node that it calls index.js.Step 2: Implement the formula’s operation
Search for the formula file of your formula and implement the method performing the operation of your automation. See some code examples:
def run(number_one, number_two):
sum = number_one + number_two
print("The sum is", sum)
package com.ritchie.formula;
public class Formula {
private Integer numberOne;
private Integer numberTwo;
public String run() {
Integer sum = numberOne + numberTwo;
return String.format("The sum is %s", sum);
}
public Formula(Integer numberOne, Integer numberTwo) {
this.numberOne = numberOne;
this.numberTwo = numberTwo;
}
public Integer getNumberOne() {
return numberOne;
}
public void setNumberOne(Integer numberOne) {
this.numberOne = numberOne;
}
public Integer getNumberTwo() {
return numberTwo;
}
public void setNumberTwo(Integer numberTwo) {
this.numberTwo = numberTwo;
}
}
package formula
import (
"fmt"
)
type Formula struct {
NumberOne int
NumberTwo int
}
func (f Formula) Run() {
sum := f.NumberOne + f.NumberTwo
fmt.Println("The sum is", sum)
}
function Run(numberOne, numberTwo) {
var sum = numberOne + numberTwo
console.log("The sum is " + sum)
}
const formula = Run
module.exports = formula
Step 3: Test the formula on your terminal
- Test with prompt
~ rit math sum numbers
? Number one : 1
? Number two : 2
The sum is 3
- Test with input flags
~ rit math sum numbers --rit_number_one="1" --rit_number_two="2"
The sum is 3
If you want to test your formula more, see some suggestions below:
- Add a validation of the input parameters to return an error to the user if the parameter is not an integer.
- Allow the user to sum negative numbers with positive ones.
- Allow the user to digit decimals in addition to integers.
Next steps
👉 If you’ve completed this first tutorial, let’s go to the second one How to use GitHub crendentials.
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