filter - nodef/extra-lists GitHub Wiki

Keep entries which pass a test.

Similar: map, reduce, filter, filterAt, reject, rejectAt.

function filter(x, ft)
// x:  lists
// ft: test function (v, k, x)

const xlists = require('extra-lists');

var x = ['a', 'b', 'c', 'd', 'e'], [1, 2, 3, 4, 5](/nodef/extra-lists/wiki/'a',-'b',-'c',-'d',-'e'],-[1,-2,-3,-4,-5);
xlists.filter(x, v => v % 2 === 1);
// → [ [ 'a', 'c', 'e' ], [ 1, 3, 5 ] ]

xlists.filter(x, v => v % 2 === 0);
// → [ [ 'b', 'd' ], [ 2, 4 ] ]

References

• Data.List.filter: Haskell
• Array.prototype.filter: MDN web docs
• array_filter: PHP
• _.remove: lodash
• _.without: lodash
• _.compact: lodash
• _.pull: lodash
• _.pullAll: lodash
• _.pullAllBy: lodash
• _.pullAllWith: lodash
• Array.filter: sugarjs
• Array.exclude: sugarjs
• Array.compact: sugarjs
• array-tools.where: @75lb