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JavaScript Snippets

Arrays

Using `.some` instead of `.filter`

I had an array that contained flags for a user. If it contained a special flag type, I would do one thing - if not, do something else. Instead of filtering out all objects with that type and then seeing if the resulting array has a length, just use .some.
The example below isn't a massive code saver but it uses the .some method properly

const actions = [ /* List of objects with a type property */ ];

// Original
if (actions.filter(o => o.type === 'error').length) {
  // do something
}

// Improved Version
if (actions.some(o => o.type === 'error')) {
  // do something
}

Arrays