How to check order in typescript-CodePudding

I have list like ['one', 'two', 'finish', 'one', 'two', 'two']:

If 'two' comes before 'finish' and then after finish I need to return checkFlag = true

I tried with below code.

const empList = ['one', 'two', 'finish', 'one', 'two', 'two'];

const map = new Map(empList.map((emp, index) => [emp, index]));

const checkFlag = map.get('two') < map.get('finish');
console.log(checkFlag);

CodePudding user response：

const empList = ['one', 'two', 'finish', 'one', 'two', 'two'];
const firstPoint = empList.indexOf('two');
const finishIndex = empList.indexOf('finish');
const lastPoint = empList.lastIndexOf('two');

console.log(firstPoint < finishIndex && finishIndex < lastPoint)

CodePudding user response：

const empList = ['one', 'two', 'finish', 'one', 'two', 'two'];

const finish = empList.indexOf('finish');

const checkFlag = empList.indexOf('two') < finish && empList.lastIndexOf('two') > finish;
console.log(checkFlag);

CodePudding user response：

There is also a way to do this in just one iteration of that array, which would be something like this:

const empList = ['one', 'two', 'finish', 'one', 'two', 'two'];
var checkFlag = false
const relevant = []
for (const element of empList){
  if(element === "two"){
    relevant.push(true)
  } else if(element === "finish"){
    relevant.push(false)
  }
}

if(
  relevant[0] 
  && relevant[relevant.length - 1] 
  && relevant.length >= 3
){
  checkFlag = true
}

console.log(checkFlag)