arraysSetsAndObjectsMaps.md

[JavaScript] - Arrays vs Sets and Objects vs Maps

Arrays:

task = ['Code', 'Eat', 'Code'];

• Use when you need ordered list of values (might contain duplicates).
• Use when you need to manipulate data

Sets:

task = new Set(['Code', 'Eat', 'Code']);

• Use when you need to work with unique values.
• Use when high performance is really important.
• Use to remove duplicates from arrays.

Objects:

task = {
  task: 'Code',
  date: 'today',
  repeat: true,
}

• More "traditional" key/ value store ("abused" objects).
• Easier to write and access values with . and [].

Maps:

task = new Map([
  ['task', 'Code'],
  ['date', 'Today'],
  [false, 'Start Coding'],
])

• Better performance.
• Keys can have any data type.
• Easy to iterate.
• Easy to compute size.