search

Finds key of an entry passing a test.

Alternatives: search, searchAll.
Similar: find, search, searchValue.

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

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

var x = [['a', 'b', 'c', 'd'], [1, 2, 3, 2]];
xlists.search(x, v => v === 2);
// → 'b'                       ^

xlists.search(x, v => v === 4);
// → undefined

References

• List-Extra.elemIndex: elm
• iterable-binsearch: @krisselden
• binarysearch: @soldair