Vectors

• for vector of chars = String.chars().collect()

  Just String.chars() will be dependent on the previous string. It cant be used if the string gets dropped.

  collect() is particularly useful while scanning.

• Map func: (transforms iterator, implements [FnMut])

  let a = [1,2,3];
  println!("{:#?}",a.map(|x| 2*x));
  

  But map () is lazy , ex: a.map(|x| println!(x)) wont work.

• Fold func: Folds every element into an accumulator.

  let a = [1,2,3]
  let sum = a.iter().fold(0,|acc,x| acc+x);
  

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