function expression vs function declaration
const functionExpression = function(width, height) {
return width * height;
};
console.log(functionExpression(3, 4));
// Result = 12
function functionDeclaration(width,height){
return width * height;
};
console.log(functionDeclaration(3,4));
//Result = 12function expression vs function declaration
Example: Function Expression
alert(foo()); // ERROR! foo wasn't loaded yet
var foo = function() { return 5; }
Example: Function Declaration
alert(foo()); // Alerts 5. Declarations are loaded before any code can run.
function foo() { return 5; }
Function declarations load before any code is executed while Function
expressionsload only when the interpreter reaches that line of code.
Similar to the var statement, function declarations are hoisted to the
top of other code. Function expressions aren’t hoisted, which allows
them to retain a copy of the local variables from the scope where
they were defined.js function expression
const plantNeedsWater = function(day){
if (day === 'Wednesday'){
return true;
} else{
return false;
}
}
console.log(plantNeedsWater('Tuesday'))function expression
const getRectArea = function(width, height) {
return width * height;
};
console.log(getRectArea(3, 4));
// expected output: 12Copyright © 2021 Codeinu
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