What Does `>=` Mean in JavaScript When Used to Define a Function?

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What's the Meaning of ">=" (an Arrow Formed from Equals & Greater Than) in JavaScript?

The Arrow Function

In JavaScript, ">=" represents an arrow function, a concise syntax introduced in ECMAScript 6. Arrow functions are similar to function expressions but have some key differences.

Syntax:

(parameters) => {
  // Code block
}

Example:

const isEven = num => num % 2 === 0;

How Arrow Functions Work:

• Lexical This Binding: Arrow functions inherit the this value from their parent scope, unlike regular functions that may bind their own.
• Shorthand Syntax: They provide a simplified way to write concise function expressions, especially when the function body consists of a single expression.
• Elimination of Redundant Return: For single-expression arrow functions, the curly braces and return statement are optional. The expression's value is implicitly returned.

Example Code:

const words = ["up", "all", "night", "for", "good", "fun"];

// Old-school function expression
const lengths = words.map(function(word) {
  return word.length;
});

// Arrow function
const lengths2 = words.map(word => word.length);

// Both `lengths` and `lengths2` will be equal to [2, 3, 5, 3, 4, 3]

Compatibility:

Arrow functions have varying levels of support in different browsers. Check the latest browser compatibility information at CanIUse.com.

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