operators and loops

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operators

i++ 优先级高于 ++i

loops

differences

  • A for loop is used when you know the number of iterations the loop needs to make.
  • A while loop can be used when you need your loop to run an unknown number of times until a specific condition is met.
  • for/in - loops through the properties of an object. while - loops through a block of code while a specified condition is true. do/while - loops through a block of code once, and then repeats the loop while a specified condition is true.

skip loops

  • The break statement “jumps out” of a loop.

  • The continue statement “jumps over” one iteration in the loop.