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Find and return array positions of multiple values JavaScript
We have to write a function, say findPositions() that takes in two arrays as argument. And it should return an array of the indices of all the elements of the second array present in the first array.
For example −
If the first array is [‘john’, ‘doe’, ‘chris’, ‘snow’, ‘john’, ‘chris’], And the second array is [‘john’, chris]
Then the output should be −
[0, 2, 4, 5]
Therefore, let’s write the code for this function. We will use a forEach() loop here;
Example
const values = ['michael', 'jordan', 'jackson', 'michael', 'usain',
'jackson', 'bolt', 'jackson'];
const queries = ['michael', 'jackson', 'bolt'];
const findPositions = (first, second) => {
const indicies = [];
first.forEach((element, index) => {
if(second.includes(element)){
indicies.push(index);
};
});
return indicies;
};
console.log(findPositions(values, queries));Output
The output in the console will be −
[ 0, 2, 3, 5, 6, 7 ]
Updated on: 25-Aug-2020
3K+ Views
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