Skip to content
Advertisement

Javascript compare two tables

I need help with comparing two tables that presents like this:

table A = [1, 2, 3, 4, 5, 6, 7],
table B = [2, 4]

I need to check if the table A contains numbers from table B and to put it in another array:

Expected output:

table C = [false, true, false, true, false, false, false]

Tried a few things but nothing works out for me. The table.includes method gives me following output

let isAdded = [];
  allObjectivesArray.forEach((element, index) => {
    if (allObjectivesArray.includes(reducedArr[0][element - 1])) 
isAdded.push(true);
    else isAdded.push(false);

});

// That is the output of above isAdded = [true, true, false, false, false, false, false]

Thank you for your help.

Advertisement

Answer

You can map the array a and check in the callback if each item exists in the array b with includes function, if exists includes will return true if not will return false

const a = [1, 2, 3, 4, 5, 6, 7];
const b = [2, 4];

const result = a.map(i => b.includes(i))

console.log(result)
User contributions licensed under: CC BY-SA
10 People found this is helpful
Advertisement