| 1 | 'use strict';
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| 2 | function id(v) {
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| 3 | return v;
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| 4 | }
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| 5 | function cmp(a, b) {
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| 6 | return a < b ? -1 : (a > b ? 1 : 0);
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| 7 | }
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| 8 | function range(x, fc = null, fm = null) {
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| 9 | var fc = fc || cmp, fm = fm || id;
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| 10 | var mi = -1, mu, mv;
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| 11 | var ni = -1, nu, nv;
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| 12 | var i = -1;
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| 13 | for (var u of x) {
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| 14 | var v = fm(u, ++i, x);
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| 15 | if (i === 0 || fc(v, mv) < 0) {
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| 16 | mi = i;
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| 17 | mu = u;
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| 18 | mv = v;
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| 19 | }
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| 20 | if (i === 0 || fc(v, nv) > 0) {
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| 21 | ni = i;
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| 22 | nu = u;
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| 23 | nv = v;
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| 24 | }
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| 25 | }
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| 26 | return [[mi, mu], [ni, nu]];
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| 27 | }
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| 28 | module.exports = range;
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