Exploring the retrieval of specific values through bitwise operations in Angular

Question

Exploring the retrieval of specific values through bitwise operations in Angular

Currently, I am facing a challenge in retrieving a value that I had initially saved in the database as a sum of bits. My development work is based on Angular 9 using Typescript.

I have successfully managed to store the sum of bits in the database. Now, I need to display these values on another screen by fetching them from the database.

Assuming that in my .ts file, I have an array of strings:

bitwiseLabels: string[] =
    ['Kitchen', 'Bedroom', 'Living Room'];

From the database, I retrieve the number 3, which represents the sum of 1 and 2. As a result, I want to display 'Kitchen' and 'Bedroom' on the screen respectively.

Unfortunately, I haven't been able to find a working solution so far. Any advice or suggestions would be greatly appreciated.

angular typescript bitwise-operators

Answer 1

Answer №1

To retrieve the initial values, you can utilize bit masks:

const getItems = (elements, select) =>
    elements.filter((_, index) => select & (1 << index));

const bitwiseOptions = ['option A', 'option B', 'option C'];

   
    
console.log(getItems(bitwiseOptions, 3));

console.log(getItems(bitwiseOptions, 4));

console.log(getItems(bitwiseOptions, 5));

console.log(getItems(bitwiseOptions, 6));

console.log(getItems(bitwiseOptions, 7));

If you wish to extract individual numerical values, the following approach can be taken:

const getItems = (elements, select) =>
    elements.map((_, index) => 1 << index).filter((i) => select & i);

const bitwiseOptions = ['option A', 'option B', 'option C'];

   
    
console.log(getItems(bitwiseOptions, 3));

console.log(getItems(bitwiseOptions, 4));

console.log(getItems(bitwiseOptions, 5));

console.log(getItems(bitwiseOptions, 6));

console.log(getItems(bitwiseOptions, 7));

Answer 2

To retrieve the initial values, you can utilize bit masks:

const getItems = (elements, select) =>
    elements.filter((_, index) => select & (1 << index));

const bitwiseOptions = ['option A', 'option B', 'option C'];

   
    
console.log(getItems(bitwiseOptions, 3));

console.log(getItems(bitwiseOptions, 4));

console.log(getItems(bitwiseOptions, 5));

console.log(getItems(bitwiseOptions, 6));

console.log(getItems(bitwiseOptions, 7));

If you wish to extract individual numerical values, the following approach can be taken:

const getItems = (elements, select) =>
    elements.map((_, index) => 1 << index).filter((i) => select & i);

const bitwiseOptions = ['option A', 'option B', 'option C'];

   
    
console.log(getItems(bitwiseOptions, 3));

console.log(getItems(bitwiseOptions, 4));

console.log(getItems(bitwiseOptions, 5));

console.log(getItems(bitwiseOptions, 6));

console.log(getItems(bitwiseOptions, 7));

Exploring the retrieval of specific values through bitwise operations in Angular

Answer №1

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