The avatar for @ssen0117
Ssen Kim
Public
Edited
Feb 18, 2023
Fork of Observable Syntax Essentials
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2
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.5 // type a floating point here
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10000000000000000000000000
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13 % 5
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3+2==4
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5 < 4
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5 > 4 && 5 > 3
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false || true
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'James'
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myName = 'James' + ' Gordon'
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myName.length
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myName.toLowerCase()
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myName.toUpperCase()
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`$My name is ${myName}, and I am ${20 + 20} years old`
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md `
1. item 1
1. item 2
1. item 3
`
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md `# it's heading`
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md `## it's heading`
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md `### it's heading`
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md `#### it's heading`
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myName.length
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array = ['a', 'b', 'c']
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array[2]
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// now slice from the right
array.slice(1)
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// now slice from both sides
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// turn an array into a string?
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'I put my thing down and split and reverse it'.split('').reverse().join('')
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object = ({key1: 'value1', key2: 'value2', key3: 3})
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Object.values(object)
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data = [
{city: "Seattle", annual_hours_sunshine: 2163, annual_precipitation: 37.13},
{city: "New York", annual_hours_sunshine: 2677, annual_precipitation: 46.23},
{city: "Chicago", annual_hours_sunshine: 2504, annual_precipitation: 39.04},
]
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data_city = [
{year: 2005, Continents: "Africa",undernourishedP:189.9 },
{year: 2005, Continents: "Asia",undernourishedP:552.5 },
{year: 2005, Continents: "Latin America and the caribbean",undernourishedP:51.7 },
{year: 2005, Continents: "Oceania",undernourishedP:2.3 }
]
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data_city
Type Table, then Shift-Enter. Ctrl-space for more options.

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// define a block here
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function percentChange(n,o){
return ((n-o)/o)*100
}
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percentChange(80,20)
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percentChange(100, 50)
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percentChangeArrow = (n,o) => ((n-o)/o)*100
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percentChangeArrow(100, 50)
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precip = d => d.annual_precipitation
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precip (data[2])
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city_C = d=>d.undernourishedP
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city_C(data_city[2])
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d3=require('d3-array')
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d3.mean(data, d=>d.annual_precipitation)
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d3.mean(data_city, d=>d.undernourishedP)
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d3.min(data, d => d.annual_precipitation)
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d3.min(data_city, d=>d.undernourishedP)
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d3.max(data, d => d.annual_precipitation)
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d3.max(data_city, d=>d.undernourishedP)
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import {printTable} from '@uwdata/data-utilities'
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printTable(data)
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printTable(data_city)
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