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Harris Lapiroff
Principal Web Developer at Freedom of the Press Foundation
Workspace
Fork
Published
By
Harris Lapiroff
Edited
Apr 20, 2022
9 stars
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
sineWave
=
(
period
=
1
,
amplitude
=
2
)
=>
x
=>
amplitude
*
Math
.
sin
(
x
*
2
*
Math
.
PI
/
period
)
Insert cell
squareWave
=
(
period
=
1
,
amplitude
=
2
)
=>
x
=>
amplitude
*
Math
.
sign
(
Math
.
sin
(
x
*
2
*
Math
.
PI
/
period
)
)
Insert cell
4
triangleWave
=
(
period
=
1
,
amplitude
=
2
)
=>
(
x
=>
Math
.
abs
(
x
/
period
+
0.25
-
Math
.
floor
(
x
/
period
+
.75
)
)
*
4
*
amplitude
-
amplitude
)
Insert cell
sawtoothWave
=
(
period
=
1
,
amplitude
=
2
)
=>
x
=>
(
2
*
amplitude
/
period
)
*
mod
(
x
,
period
)
-
amplitude
Insert cell
functions
=
new
Map
(
[
[
'sine'
,
sineWave
(
period
,
amplitude
)
]
,
[
'square'
,
squareWave
(
period
,
amplitude
)
]
,
[
'triangle'
,
triangleWave
(
period
,
amplitude
)
]
,
[
'sawtooth'
,
sawtoothWave
(
period
,
amplitude
)
]
,
]
)
Insert cell
samples
=
mapMap
(
functions
,
fn
=>
build_samples
(
fn
,
-
4
,
4
,
{
N
:
500
}
)
)
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
capfirst
=
str
=>
str
.
slice
(
0
,
1
)
.
toUpperCase
(
)
+
str
.
slice
(
1
)
Insert cell
3
mod
=
(
n
,
m
)
=>
(
(
n
%
m
)
+
m
)
%
m
Insert cell
mapMap
=
(
map
,
fn
)
=>
new
Map
(
Array
.
from
(
map
)
.
map
(
(
[
key
,
val
]
)
=>
[
key
,
fn
(
val
)
]
)
)
Insert cell
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squareWave
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triangleWave
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functions
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samples
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capfirst
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mod
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mapMap
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