fundamentals

name	fundamentals
description	Core JavaScript fundamentals including variables, data types, operators, control flow, and basic syntax. Essential foundation for all JavaScript development.
sasmp_version	1.3.0
bonded_agent	01-javascript-fundamentals
bond_type	PRIMARY_BOND
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JavaScript Fundamentals Skill

Quick Reference Card

Variable Declaration

const PI = 3.14159;     // Immutable binding (preferred)
let count = 0;          // Reassignable
var legacy = "avoid";   // Function-scoped (avoid)

8 Data Types

Type	Example	typeof
String	"hello"	"string"
Number	42, 3.14, NaN	"number"
Boolean	true, false	"boolean"
Null	null	"object"
Undefined	undefined	"undefined"
Symbol	Symbol('id')	"symbol"
BigInt	9007199254740991n	"bigint"
Object	{}, [], fn	"object"

Operators Cheat Sheet

// Arithmetic
+ - * / % **

// Comparison (always use strict)
=== !== > < >= <=

// Logical
&& || !

// Nullish
?? ?.

// Assignment
= += -= *= /= ??= ||= &&=

Control Flow Patterns

// Early return (preferred)
 () {
   (!input)  { :  };
   (input. < )  { :  };
   { :  };
}


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