Ooodle-Calculator.js

const number = [1,2,3,4,5,6,7,8,9];
const number1 = [1,2,3,4,5,6,7,8,9,10,11,12];

let answer = "";
let setanswer = [];

number.map(a => {
  number.map(b => {
    number.map(c => {
      number.map(d => {
        if(a*b+c-d === 12) {
          if(a !== b && a !== c && a !== d && b !== c && b !== d && c !== d) {
            if(true)
              answer = `${a} - ${b} - ${c} - ${d}`;
              setanswer.push(answer);
          }
        }
      })
    })
  })
})

setanswer.map(x => {
  console.log(x + "\n");
});