Day 2 of 21 Days of Javascript

Michael Tefula

Michael Tefula

— 1 min read

Day 2 Learnings

Today I firmed up three main ways of writing functions

  • Function Expressions (Need semicolon at the end, not hoisted.)
  • Function Declarations (No semicolon, hoisted.)
  • Arrow Functions (Short syntax, , not hoisted.)

Here's some example code:

// 1. Function Expression
// - Assigned to a variable named min
// - Needs a semicolon at the end
// - Not hoisted: can't call before this line
const min = function(a, b) {
    return (a < b) ? a : b;
};

console.log(min(3, 5));  // Outputs: 3


// 2. Function Declaration
// - Declares a function named min
// - No semicolon needed
// - Hoisted: can call before declaration
console.log(min(4, 9));  // Works because of hoisting, outputs: 4

function min(a, b) {
    return (a < b) ? a : b;
}


// 3. Arrow Function
// - Assigned to a variable named min
// - Needs a semicolon at the end
// - Not hoisted: can't call before this line
const min = (a, b) => (a < b) ? a : b;

console.log(min(6, 2));  // Outputs: 2

Read more