CODE EXAMPLE FOR JAVASCRIPT

Edit parameter in variable with increment/decrement box and save it

const K = [{ L: 34, M: 56, A: 64, B: 65 }, { L: 35, M: 55, A: 47, B: 89 }];
const newArray = K.map(element => ({...element, A: element.A + 1}));
console.log(newArray);
//[{ L: 34, M: 56, A: 65, B: 65 }, { L: 35, M: 55, A: 48, B: 89 }]