Attempting to determine the length of an array using ES6 with the following code, but encountering issues.
a=[[1,2,3,4],[4,5,6]]
result = a.map(d=>({d[0]:d.length}))
console.log(result)
The correct method is:
a=[[1,2,3,4],[4,5,6]]
result = a.map(d=>({name:d[0], length:d.length}))
console.log(result)
To create a key for an object from a variable in ES6, you need to enclose it within square brackets [].
For instance:
const key = 'category';
const item = {
[key]: 'food',
};
console.log(item);Therefore, the code snippet you are interested in should look like this:
a=[[1,2,3,4],[4,5,6]]
result = a.map(arr=>({[arr[0]]: arr.length}))
console.log(result)If you want to create an array of objects where the first element of each subarray becomes the property name and the length of the subarray becomes the property value, you can achieve it using the following code snippet:
let arr = [[1,2,3,4],[4,5,6]];
let result = arr.map(item => ({[item[0]]: item.length}));
console.log(result);
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