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function randomItem(array) {
return array[Math.floor(Math.random() * array.length)]
}
function ordinalSuffix(v) {
let n = Number(v)
if (n > 20) {
n = n % 10
}
switch (n) {
case 1:
return 'st'
case 2:
return 'nd'
case 3:
return 'rd'
default:
return 'th'
}
}
function testOrdinalSuffix() {
const tests = {1: 'st',
2: 'nd',
3: 'rd',
4: 'th',
10: 'th',
11: 'th',
12: 'th',
13: 'th',
14: 'th',
20: 'th',
21: 'st',
32: 'nd',
43: 'rd',
44: 'th',
100: 'th',
101: 'st'}
for (const t of Object.keys(tests)) {
const got = ordinalSuffix(t)
const want = tests[t]
console.assert(got === want,
`bad suffix for ${t}: ${got} !== ${want}`)
}
}
export { ordinalSuffix, testOrdinalSuffix, randomItem }
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