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Subhajit Sahu edited this page Dec 5, 2022 · 17 revisions

Find key of an entry passing a test.

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

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

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

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

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

References