try/catch es10

An update for developer convience allows the use of try/catch without an explicit e Error reference in the catch call.

// Before
try {
  fetch('https://example.com')
} catch (e) {
  console.log(`e`)
}

After:

// After
try {
  fetch('https://example.com')
} catch {
  console.log(`something wrong.`)
}

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Merge Array

How to combine two sorted arrays into one? We can do this easily with the spread operator.

Use flatMap() creates a new array with sub-array elements flattened by specified depth.