Binary searches rightmost value in sorted array. :running: :vhs: :package: :moon: :ledger:

Alternatives: bsearch, bsearchRight, bsearchAny, bsearchClosest. This is part of package extra-array.

array.bsearchRight(x, v, [fc], [fm]);
// x:  an array (sorted)
// v:  search value
// fc: compare function (a, b)
// fm: map function (v, i, x)
// --> last index of value | ~(index of closest value)

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

var x = [1, 3, 3, 3, 5];
array.bsearchRight(x, 3);
// 3              ^ found rightmost

array.bsearchRight(x, 4);
// -5 (~4)           ^ not found, closest

var x = [1, -3, -3, -3, 5];
array.bsearchRight(x, 3, (a, b) => Math.abs(a) - Math.abs(b));
// 3                 ^

array.bsearchRight(x, 3, null, v => Math.abs(v));
// 3                 ^

references

• _.sortedLastIndex: lodash
• _.sortedLastIndexBy: lodash
• _.sortedLastIndexOf: lodash
• array-binsearch: @krisselden
• binarysearch: @soldair
• binary-search: @darkskyapp