forked from helpers/handlebars-helpers
-
Notifications
You must be signed in to change notification settings - Fork 5
/
math.js
237 lines (204 loc) · 7.83 KB
/
math.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
const assert = require('assert');
const hbs = require('handlebars').create();
const helpers = require('..');
helpers.math({ handlebars: hbs });
describe('math', function() {
describe('abs', function() {
it('should return the absolute value of a positive number.', function() {
const fn = hbs.compile('{{abs value}}');
assert.equal(fn({value: 5}), '5');
});
it('should return the absolute value of a positive number.', function() {
const fn = hbs.compile('{{abs value}}');
assert.equal(fn({value: -5}), '5');
});
it('should throw if not a number.', function() {
const fn = hbs.compile('{{abs value}}');
assert.throws(() => fn({value: 'nope'}));
});
});
describe('add', function() {
it('should return the sum of two numbers.', function() {
const fn = hbs.compile('{{add value 5}}');
assert.equal(fn({value: 5}), '10');
});
it('should return the sum of two stringified numbers.', function() {
const fn = hbs.compile('{{add "100" "200"}}');
assert.equal(fn({}), '300');
});
});
describe('average', function() {
it('should return the average of a list of numbers:', function() {
const fn = hbs.compile('{{avg 1 2 3 4}}');
assert.equal(fn(), '2.5');
});
it('should return the average of an array of numbers:', function() {
const fn = hbs.compile('{{avg array}}');
assert.equal(fn({array: [1, 3, 6, 9]}), '4.75');
});
});
describe('ceil', function() {
it('should return the value rounded up to the nearest integer.', function() {
const fn = hbs.compile('{{ceil value}}');
assert.equal(fn({value: 5.6}), '6');
});
it('should return the string value rounded up to the nearest integer.', function() {
const fn = hbs.compile('{{ceil value}}');
assert.equal(fn({value: '5.6'}), '6');
});
it('should throw an error for non-numbers.', function() {
const fn = hbs.compile('{{ceil value}}');
assert.throws(() => fn({value: 'nope'}));
});
});
describe('divide', function() {
it('should return the division of two numbers.', function() {
const fn = hbs.compile('{{divide value 5}}');
assert.equal(fn({value: 5}), '1');
});
it('should return the division of two stringified numbers.', function() {
const fn = hbs.compile('{{divide value "5"}}');
assert.equal(fn({value: '5'}), '1');
});
it('should throw an error if the first number is invalid.', function() {
const fn = hbs.compile('{{divide value 5}}');
assert.throws(() => fn({value: 'abc'}));
});
it('should throw an error if the second number is invalid.', function() {
const fn = hbs.compile('{{divide value "abcd"}}');
assert.throws(() => fn({value: 5}));
});
});
describe('floor', function() {
it('should return the value rounded down to the nearest integer.', function() {
const fn = hbs.compile('{{floor value}}');
assert.equal(fn({value: 5.6}), '5');
});
it('should throw an error if the number is invalid', function() {
const fn = hbs.compile('{{floor value}}');
assert.throws(() => fn({value: 'abc'}));
});
});
describe('minus', function() {
it('should return the difference of two numbers.', function() {
const fn = hbs.compile('{{minus value 5}}');
assert.equal(fn({value: 5}), '0');
});
it('should return the difference of two stringified numbers.', function() {
const fn = hbs.compile('{{minus value "5"}}');
assert.equal(fn({value: '5'}), '0');
});
it('should throw an error if the first number is invalid.', function() {
const fn = hbs.compile('{{minus value 5}}');
assert.throws(() => fn({value: 'abc'}));
});
it('should throw an error if the second number is invalid.', function() {
const fn = hbs.compile('{{minus value "abcd"}}');
assert.throws(() => fn({value: 5}));
});
});
describe('modulo', function() {
it('should return the modulus of two numbers.', function() {
const fn = hbs.compile('{{multiply value 5}}');
assert.equal(fn({value: 5}), '25');
});
it('should return the multiplication of two stringified numbers.', function() {
const fn = hbs.compile('{{multiply value "5"}}');
assert.equal(fn({value: '5'}), '25');
});
});
describe('multiply', function() {
it('should return the modulus of two numbers.', function() {
const fn = hbs.compile('{{modulo value 4}}');
assert.equal(fn({value: 25}), '1');
});
it('should return the modulus of two stringified numbers.', function() {
const fn = hbs.compile('{{modulo value "4"}}');
assert.equal(fn({value: '25'}), '1');
});
});
describe('plus', function() {
it('should return the first number with the second number added.', function() {
const fn = hbs.compile('{{plus value 5}}');
assert.equal(fn({value: 25}), '30');
});
it('should return the modulus of two stringified numbers.', function() {
const fn = hbs.compile('{{plus value "5"}}');
assert.equal(fn({value: '25'}), '30');
});
});
describe('random', function() {
it('should return a random number between two values.', function() {
const fn = hbs.compile('{{random 5 10}}');
const result = +fn();
assert(result >= 5);
assert(result <= 10);
assert(Number.isInteger(result));
});
it('should return a random number between two stringified values.', function() {
const fn = hbs.compile('{{random "5" "10"}}');
const result = +fn();
assert(result >= 5);
assert(result <= 10);
assert(Number.isInteger(result));
});
});
describe('remainder', function() {
it('should return the remainder of two numbers.', function() {
const fn = hbs.compile('{{remainder value 5}}');
assert.equal(fn({value: 7}), '2');
});
it('should return the remainder of two stringified numbers.', function() {
const fn = hbs.compile('{{remainder value "5"}}');
assert.equal(fn({value: '7'}), '2');
});
it('should take the sign of the dividend.', function() {
const fn = hbs.compile('{{remainder 5 -3}}');
assert.equal(fn(), '2');
});
});
describe('round', function() {
it('should return the value rounded to the nearest integer.', function() {
const fn = hbs.compile('{{round value}}');
assert.equal(fn({value: 5.69}), '6');
});
it('should return the stringified value rounded to the nearest integer.', function() {
const fn = hbs.compile('{{round value}}');
assert.equal(fn({value: '5.69'}), '6');
});
it('should throw an error for an invalid value', function() {
const fn = hbs.compile('{{round value}}');
assert.throws(() => fn({value: 'abc'}));
});
});
describe('subtract', function() {
it('should return the difference of two numbers.', function() {
const fn = hbs.compile('{{subtract value 5}}');
assert.equal(fn({value: 5}), '0');
});
});
describe('sum', function() {
it('should return the sum of multiple numbers.', function() {
const fn = hbs.compile('{{sum value 67 80}}');
assert.equal(fn({value: 20}), '167');
});
it('should return the sum of multiple numbers.', function() {
const fn = hbs.compile('{{sum 1 2 3}}');
assert.equal(fn(), '6');
});
it('should return the total sum of array.', function() {
const fn = hbs.compile('{{sum value}}');
assert.equal(fn({value: [1, 2, 3]}), '6');
});
it('should return the total sum of array and numbers.', function() {
const fn = hbs.compile('{{sum value 5}}');
assert.equal(fn({value: [1, 2, 3]}), '11');
});
});
describe('times', function() {
it('should multiply a number by another number.', function() {
const fn = hbs.compile('{{times value 10}}');
assert.equal(fn({value: 20}), '200');
});
});
});