Samenvatting Web 2

Ecmascript 6

ES5 –‘use strict’
• Placed at the top of a file
• Executes the browser in ‘strict’ mode
• Easier to write safe javascript
• Feedback on errors
• Remove bad practices

Hoisting principle




Standard behaviour by javascript to place all declarations to the top of the current scope

Let




• New way to declare variables
• Hoisting is not applied
• Easier to detect bad code or errors




No hoisting is applied so teacherSalary is unknown. This does not crash because the code is
executed AFTER the declaration.

,Const




• New way to declare constants
• Hoisting is not applied
• Easier to detect bad code or error




Template Literals
• New and easier way of concatenating strings
• Use the backtick instead of single quotes.
• Backtick: ``
• Single quote: ‘’

Template literal: ${expression}

, Destructuring
Allows the retrieval of values from an array on the left side of the statement.




Object destructuring




Object destructuring function




Destructing the function moveCourse will result in a broken version.
Keyword ‘this’ does not point to the object.