::some()

Array.some for iterables.

Installation

$ npm install iterable-some

Usage

import some from 'iterable-some/module';

// or:
const some = require('iterable-some');

These are all true:

[true]::some(function() { return this; });

[false, null, 0, 'truthy']::some(function() { return this; });

new Set([5])
  ::some(function() { return this > 4; })
;

new Map([2, 'nope'], [5, 'yup'])
  ::some(function() { return this === 'yup'; })
;

– and these are false:

[false, false]::some(function() { return this; });

[]::some(function() { return this; });

new Set([3, 1, 0, 4])
  ::some(function() { return this > 4; })
;

::some() is lazy – just as Array.some. It stops executing the condition as soon as it finds one match:

[0, 1, 'not checked']::some(function() {
  if (this > 0) return true;
  if (this === 'not checked') throw 'No worries, this won’t be thrown.'
});

It works great with trine-style libraries:

import isTruthy from 'this-is-truthy/module';

[null, undefined, 0, NaN]::some(isTruthy);
//» false

Huh?

If you’re wondering what the :: thing means, you’d better read this excellent overview by @jussi-kalliokoski or have a look at the function bind syntax proposal.

License

MIT © Tomek Wiszniewski