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Add friday13th method #720

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Add friday13th method #720

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074f47d
Add friday13th method
kmitrovic Jun 9, 2020
7941f5f
Merge branch 'master' into master
kmitrovic Apr 6, 2021
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,7 @@ is(13).thirteen(); // true
is(12.8).roughly.thirteen(); // true
is(6).within(10).of.thirteen(); // true
is(2008).yearOfBirth(); // true
is(new Date("2020-03-13")).friday13th(); // true

// check your math skillz
is(4).plus(5).thirteen(); // false
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2 changes: 2 additions & 0 deletions consts.js
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Expand Up @@ -2,6 +2,7 @@

const THIRTEEN = 13;
const THIRTEEN_FUZZ = 0.5;
const FRIDAY = 5;

var thirteenStrings = [
"xiii", // Roman numeral 13
Expand Down Expand Up @@ -354,5 +355,6 @@ var thirteenStrings = [
module.exports = {
THIRTEEN: THIRTEEN,
THIRTEEN_FUZZ: THIRTEEN_FUZZ,
FRIDAY: FRIDAY,
thirteenStrings: thirteenStrings
};
7 changes: 7 additions & 0 deletions is.js
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Expand Up @@ -3,6 +3,7 @@ var consts = require('./consts');

const THIRTEEN = consts.THIRTEEN;
const THIRTEEN_FUZZ = consts.THIRTEEN_FUZZ;
const FRIDAY = consts.FRIDAY;
const thirteenStrings = consts.thirteenStrings;

'use strict';
Expand Down Expand Up @@ -107,6 +108,12 @@ var is = function is(x) {
}
return currYear - parseInt(x) == THIRTEEN
},
friday13th: function() {
if (Object.prototype.toString.call(x) !== '[object Date]') {
return false;
}
return x.getDay() === FRIDAY && x.getDate() === THIRTEEN;
},
plus: function(y) {
return is(x + y);
},
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5 changes: 5 additions & 0 deletions test.js
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Expand Up @@ -36,6 +36,11 @@ tap.equal(is("https://www.imdb.com/title/tt2991516/").thirteen(), true);
//year of birth test
tap.equal(is("2003").yearOfBirth(), false);

// Friday 13th test
tap.equal(is("not a date").friday13th(), false);
tap.equal(is(new Date("2020-06-13")).friday13th(), false);
tap.equal(is(new Date("2018-07-13")).friday13th(), true);

// Imaginary 13's tests
tap.equal(is("13+0i").thirteen(), true);
tap.equal(is("13i").thirteen(), true);
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