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Get the smallest array from an array of arrays in JavaScript
Suppose, we have a nested array of arrays like this −
const arr = [ ["LEFT", "RIGHT", "RIGHT", "BOTTOM", "TOP"], ["RIGHT", "LEFT", "TOP"], ["TOP", "LEFT"] ];
We are required to write a JavaScript function that takes in one such array. The function then should pick the smallest subarray (smallest in sense of a number of elements contained) and return it.
Example
The code for this will be −
const arr = [
["LEFT", "RIGHT", "RIGHT", "BOTTOM", "TOP"],
["RIGHT", "LEFT", "TOP"],
["TOP", "LEFT"]
];
const findShortest = (arr = []) => {
const res = arr.reduce((acc, val, ind) => {
if (!ind || val.length < acc[0].length) {
return [val];
};
if (val.length === acc[0].length) {
acc.push(val);
};
return acc;
}, []);
return res;
};
console.log(findShortest(arr));Output
And the output in the console will be −
[ [ 'TOP', 'LEFT' ] ]
Updated on 24-Nov-2020 10:46:46
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