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If you are a proficient Ruby developer looking to convert your code to Javascript, understanding key differences between the two languages is critical. This guide will walk you through the process of converting common Ruby syntax and constructs to their Javascript equivalents. While a comprehensive converter tool might not cater to all edge cases, this guide aims to streamline your manual conversion process.
In Ruby, variables are typically declared without any explicit type:
name = "John"
age = 30
In Javascript, you use var
, let
, or const
to declare variables:
let name = "John";
const age = 30; // const is immutable, while let can be reassigned
Ruby allows for defining methods using the def
keyword:
def greet(name)
"Hello, #{name}!"
end
In Javascript, functions can be declared using the function
keyword or arrow function syntax:
function greet(name) {
return `Hello, ${name}!`;
}
// Arrow Function
const greet = (name) => `Hello, ${name}!`;
Ruby's conditionals use if
, elsif
, and else
:
if age < 18
"You're a minor."
elsif age >= 65
"You're a senior."
else
"You're an adult."
end
JavaScript uses if
, else if
, and else
:
if (age < 18) {
console.log("You're a minor.");
} else if (age >= 65) {
console.log("You're a senior.");
} else {
console.log("You're an adult.");
}
A simple for loop in Ruby might look like this:
for i in 1..5
puts i
end
In Javascript, you would declare it using the for
keyword:
for (let i = 1; i <= 5; i++) {
console.log(i);
}
Ruby's each
method:
[1, 2, 3].each do |number|
puts number
end
JavaScript's forEach
method:
[1, 2, 3].forEach(number => {
console.log(number);
});
Ruby classes are defined with the class
keyword:
class Person
attr_accessor :name, :age
def initialize(name, age)
@name = name
@age = age
end
end
JavaScript class declaration:
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
getName() {
return this.name;
}
getAge() {
return this.age;
}
}
In Ruby, exceptions are handled using begin
and rescue
:
begin
# risky code
rescue => e
puts e.message
end
In JavaScript, you use try
and catch
:
try {
// risky code
} catch (e) {
console.error(e.message);
}
Converting code from Ruby to Javascript involves understanding both the syntactical and structural differences. This guide has outlined some of the most common conversions to help get you started. While there's no perfect automated free Ruby to Javascript code converter that addresses all nuances, being mindful of these differences will aid in an effective manual conversion process. Happy coding!
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