Javascript
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Fundamentals
- 1 Fundamentals 11
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Hello World
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Code structure
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Use strict
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Variables
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Data types
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Type conversions
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Maths
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Comparitions
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Conditional
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Loops
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Functions
- 2 Testing 2
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Mocha
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Nested describe
- 3 Objects 4
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Basics
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Reference
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Methods
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Constructor
- 4 Types 5
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Primitives
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Numbers
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Strings
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Arrays
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Json
- 5 Classes 3
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Constructor
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Binding
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Inheritance
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Type conversions
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Last update: 12-01-2022
Numeric
Most of the time Javascript automatically converts to the right type.
/**
* Mathematical functions and expressions ...
* strings are automatically converted to numbers.
*
* The addition operator (+) doesn't convert strings to numbers.
*/
console.log("2" + "3"); // 23, not 5
console.log("6" / "3"); // 2
console.log(Number("2") + Number("3")); // 5
console.log(String(2) + String(3)); // 23 - Look Here
Boolean
In Javascript, a non-empty string is always true.
/**
* In Javascript "0" is not threated as false (like in PHP)
*/
let a = "0";
if (a) {
console.log("hello"); // hello
}
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