Add for..in task

Author: tshemsedinov

Exercises/7-ages.js

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+'use strict';
+
+const ages = persons => {
+ // Use for..in to calculate age for each person
+ // For example ages({
+ // lenin: { born: 1870, died: 1924 },
+ // mao: { born: 1893, died: 1976 },
+ // gandhi: { born: 1869, died: 1948 },
+ // hirohito: { born: 1901, died: 1989 },
+ // })
+ // should return {
+ // lenin: 54,
+ // mao: 83,
+ // gandhi: 79,
+ // hirohito: 88,
+ // }
+};
+
+module.exports = { ages };

Exercises/7-ages.test

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+({
+ name: 'ages',
+ length: [150, 190],
+ cases: [
+ [
+ {
+ lenin: { born: 1870, died: 1924 },
+ mao: { born: 1893, died: 1976 },
+ gandhi: { born: 1869, died: 1948 },
+ hirohito: { born: 1901, died: 1989 },
+ }, {
+ lenin: 54,
+ mao: 83,
+ gandhi: 79,
+ hirohito: 88,
+ }
+ ]
+ ],
+ test: ages => {
+ const src = ages.toString();
+ if (!src.includes('for (')) throw new Error('Use for..in loop');
+ if (!src.includes(' in ')) throw new Error('Use for..in loop');
+ }
+})

Solutions/7-ages.js

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+'use strict';
+
+const ages = persons => {
+ const data = {};
+ for (const name in persons) {
+ const person = persons[name];
+ data[name] = person.died - person.born;
+ }
+ return data;
+};
+
+module.exports = { ages };