search

Finds key of an entry passing a test.

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

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

const entries = require('extra-entries');

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

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

References

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