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6.1: Immediately Invoked Function Expressions - Coggle Diagram

6.1: Immediately Invoked Function Expressions

function expression

let funcExpr = function(num) {
  console.log(num * num);
}
funcExpr(2);

invoke it immediately

let funcExpr = function(num) {
  console.log(num * num);
}(2);

variable is redundant

but can't just remove it

outputs

> Uncaught SyntaxError: Function statements require a function name

function(num) {
  console.log(num * num);
}(2);

wrap in parantheses

(function(num) {
  console.log(num * num);
})(2);

can wrap the whole thing

(function(num) {
  console.log(num * num);
}(2));