80 lines
2.6 KiB
JavaScript
80 lines
2.6 KiB
JavaScript
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export function uniq(xs) {
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var seen = {};
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return xs.filter(x => seen.hasOwnProperty(x) ? false : (seen[x] = true));
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}
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export function groupBy(xs, key) {
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return xs.reduce(function(rv, x) {
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var v = key instanceof Function ? key(x) : x[key];
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(rv[v] = rv[v] || []).push(x);
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return rv;
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}, {});
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}
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export function groupByArray(xs, key) {
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var mapping = {};
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return xs.reduce(function(rv, x) {
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var v = key instanceof Function ? key(x) : x[key];
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var el = mapping[v];
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if(el) el.values.push(x);
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else rv.push(mapping[v] = { key: v, values: [x] });
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return rv;
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}, []);
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}
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export function pivotByArray(xs, key, reducer) {
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var groups = groupByArray(xs, key);
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groups.forEach(function(group) {
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group.aggregate = group.values.reduce(reducer, {});
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});
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return groups;
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}
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export function quantile_sorted(arr_sorted, quantile) {
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var pos = (arr_sorted.length - 1) * quantile, base = Math.floor(pos), rest = pos - base;
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return arr_sorted[base + 1] !== undefined ? arr_sorted[base] + rest * (arr_sorted[base + 1] - arr_sorted[base]) : arr_sorted[base];
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}
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export function strHashCode(str) {
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var hash = 0;
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for(var i = 0; i < str.length; ++i) hash = str.charCodeAt(i) + ((hash << 5) - hash);
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return hash & hash; // convert to 32 bit
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}
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export function strHashJenkins(str) {
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for(var hash = 0, i = str.length; i--;) hash += str.charCodeAt(i), hash += hash << 10, hash ^= hash >> 6;
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hash += hash << 3;
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hash ^= hash >> 11;
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return (hash + (hash << 15) & 4294967295) >>> 0
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}
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export function strHashHex(str) {
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var hash = strHashJenkins(str), color = '#';
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for(var i = 0; i < 3; ++i) color += ('00' + ((hash >> (i * 8)) & 0xFF).toString(16)).slice(-2);
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return color;
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}
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export function strHashHSL(str, lightness='50%') {
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var hash = strHashJenkins(str);
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return 'hsl(' + (hash%360) + ',' + (hash%100) + '%,' + lightness + ')';
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}
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export function strftime_vista(date) {
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return 10000*(date.getFullYear() - 1700) + 100*(date.getMonth() + 1) + date.getDate() + date.getHours()/100 + date.getMinutes()/10000 + date.getSeconds()/1000000 + date.getMilliseconds()/1000000000;
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}
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export function strptime_vista(s) {
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s = +s;
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var date = Math.floor(s), time = s - date;
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return new Date(Math.floor(date/10000) + 1700, (Math.floor(date/100) + '').slice(-2) - 1, (date + '').slice(-2), Math.floor(time*100), (Math.floor(time*10000) + '').slice(-2), (Math.floor(time*1000000) + '').slice(-2), (Math.floor(time*1000000000) + '').slice(-3));
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}
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export function debounce(fn, delay) {
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var clock = null;
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return function() {
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clearTimeout(clock);
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var self = this, args = arguments;
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clock = setTimeout(function() { fn.apply(self, args) }, delay);
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}
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}
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