Array manipulations with JavaScript

arrayManipulations.js

// Filter unique array
const array = [1, 1, 2, 3, 5, 5, 1]
const uniqueArray = [...new Set(array)];

// Add element in an array at state
addElement = (event) => {
  this.setState(state => {
    const list = [...list, state.element];

    return {
      list,
      element: '',
    };
  });
 }
 
// Remove element in an array at state
deleteElement = indexToDelete => {
  this.setState(({ list }) => ({
    list: list.filter((toDo, index) => index !== indexToDelete)
  }));
}

transformArrayObjectsPropsToObjectValue.js

// Transform array of objects with property value to object value
const transformCustomAttributes = customAttributes => 
  customAttributes.reduce((ac, cur) => { 
    ac[cur.attribute_code] = cur.value; 
    
    return ac; 
  }, {});

const transformProperties = products => 
  products.map(cur => ({ 
    ...cur, custom_attributes: transformCustomAttributes(cur.custom_attributes) 
  }));