The avatar for @jerryjappinen
Jerry Jäppinen
Design, tech, engineering and science. Head of Design and User Research.
Public
New Programmer’s Handbook
Edited
Apr 10
Fork of Chapter 1: Logic
•
1 fork
2 stars
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1 + 2 // Clearly sum of two numbers
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"A" + "B" // Clearly combination of two strings
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1 + "2" // Join a number and a piece of text?
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function get_miles_driven () {
return 200
}
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get_miles_driven()
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get_miles_driven() > 0
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get_miles_driven() > 0 ? "Car is used" : "Car is new"
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get_miles_driven() ? "Car is used" : "Car is new"
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is_alive
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is_alive ? "green" : "red"
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is_healthy
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is_old
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is_healthy && is_old // and
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is_healthy || is_old // or
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napoleon_birth_year = 1769
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current_year = new Date().getFullYear()
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current_year - napoleon_birth_year
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(current_year - napoleon_birth_year) / 1000
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tax_rate = 0.24
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price = 17.99
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tax_free_price = price / (1 + tax_rate)
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interest_rate = 0.0288
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daily_interest_rate = interest_rate / 365
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daily_interest = capital * daily_interest_rate
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capital + daily_interest
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Date.now()
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[r, g, b]
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first_name = "Napoleon"
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last_name = "Bonaparte"
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full_name = first_name + " " + last_name
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full_name.length
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full_name.indexOf("B")
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full_name.replaceAll("a", "Σ")
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full_name.toUpperCase()
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"https://aliveordead.com/" + full_name.toLowerCase().replaceAll(" ", "-")
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numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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letters = ["a", "b", "c", "d", "e", "f"]
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numbers.length
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letters.length
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letters[1]
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[...numbers, ...letters]
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_.reverse([...numbers])
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_.slice(letters, 0, 2) // Picks 2 values, starting from the 0th position
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_.slice(letters, letters.length / 2) // Get latter half of the list
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function number_filter_condition (number) {
return number < 5
}
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_.filter(numbers, number_filter_condition)
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numbers_plus_ten = _.map(numbers, (num) => num + 10)
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_.sum(numbers)
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_.sum(numbers_plus_ten)
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letters.join(" and ")
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[numbers, numbers_plus_ten]
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_.map([numbers, numbers_plus_ten], _.sum)
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