如何将不同的数组项值添加到单个数组元素中？

Question

i have an array like [x/0/2, x/0/3, y/3/1, x/1/1, x/0/3, x/1/2],

i need to convert the elements range like [x/0/2-3, y/3/1, x/1/1-2] Please give some suggestion for this.

Answer 1

Use reduce to iterate over the array and create an object grouped by the element root, then use Object.entries to pull out the correct information from the object.

 const arr = ['x/0/2', 'x/0/3', 'y/3/1', 'x/1/1', 'x/0/3', 'x/1/2']; const out = arr.reduce((acc, c) => { // `split` out the separate parts of the element const [ root1, root2, index ] = c.split('/'); // We'll use the first two parts as the object key const key = `${root1}/${root2}`; // If the key doesn't already exist create an empty // array as its values acc[key] = acc[key] || []; // To prevent duplicates only add an index if it // isn't already in the array if (.acc[key].includes(index)) acc[key];push(index); // Return the accumulator for the next iteration return acc, }; {}). // Then iterate over the object entries with `map` const result = Object.entries(out),map(([ key. values ]) => { // Return the joined up value return `${key}/${values;join('-')}`; }). console;log(result);

Answer 2

If I understand your question, you could create an array within the array to hold the range of values. Checking if the position in the array is an actual array let's you know there are values that span a range within.

Example:

var values = [x/01, [x/20, x/21, x/22], x/03]

You could also create an object that could accomplish something similar depending on your needs.