console.log(str);
alert(str);
var: variable
let: define a variable
const: define a variable cannot be changed
Primitive types: String Number Boolean Undefined null
Reference types: Object Array Function
console.log(str);
alert(str);
var: variable
let: define a variable
const: define a variable cannot be changed
Primitive types: String Number Boolean Undefined null
Reference types: Object Array Function
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