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Reduce array in JavaScript
Suppose, we have an array of objects like this −
const arr = [
{"time":"18:00:00"},
{"time":"10:00:00"},
{"time":"16:30:00"}
];We are required to write a JavaScript function that takes in one such array and does the following −
Extract the times from the json code: so: 18:00:00, 10:00:00, 16:30:00
Convert the times to this: [18,0], [10,0], [16,30]
Put it in an array.
Return the final array.
Example
The code for this will be −
const arr = [
{"time":"18:00:00"},
{"time":"10:00:00"},
{"time":"16:30:00"}
];
const reduceArray = (arr = []) => {
let res = [];
res = arr.map(obj => {
return obj['time'].split(':').slice(0, 2).map(el => {
return +el;
});
});
return res;
};
console.log(reduceArray(arr));Output
And the output in the console will be −
[ [ 18, 0 ], [ 10, 0 ], [ 16, 30 ] ]
Updated on: 20-Nov-2020
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