class WordQuiz {
dataselect(json) {
+ this.data = json;
+ this.cats = {}; // category lookup
+ for (let i in json) {
+ let cat = json[i][3];
+ if (this.cats[cat]) {
+ this.cats[cat].push(i);
+ }
+ else {
+ this.cats[cat] = [i];
+ }
+ }
+ return this.datafilter(json);
+ }
+
+ datafilter(json) {
// find viable rows from json data
let rows = Object.values(json);
- if (this.preset.cat !== undefined) {
- let cats = {}; // category lookup
- for (let i in json) {
- let cat = json[i][3];
- if (!cats[cat]) cats[cat] = [];
- cats[cat].push(i)
- }
+ if (this.preset.cat !== undefined) {
rows = [];
- let children = cats[this.preset.cat];
+ let children = this.cats[this.preset.cat];
for (let loop = 0; children.length && loop < 20; loop++) {
rows.push(...children);
- children = children.map(cat => cats[cat]).filter(is => is).flat();
+ children = children.map(cat => this.cats[cat]).filter(is => is).flat();
}
rows = rows.map(row => json[row]).filter(row => row[2]);
}