OR运算符如何在javascript或打字稿中的find函数中工作？

Question

If I have an array of objects:

myArray = [
  {id:123, name:"abc"},
  {id:234, name:"xyz"},
  {id:345, name:"pqr"}
]

someValue = 123
someOtherObj = {id: 234}

let matchedObj = this.myArray.find(object=> object.id === somevalue || object.id === someOtherObj.id) 
console.log(matchedObj)

Would the output be 123 every time, or it could be 123 or 234? Can you explain how this works?

Answer 1

find finds the first matching entry in the array. condition1 || condition2 condition1 || condition2 is true if either condition1 or condition2 is true. (More specifically: || evaluates its left-hand operand first, and if that result is truthy, takes that truthy value as its result; if the left-hand result is falsy, || evaluates its right-hand operand and takes that value as its result.)

So with that sample data, it will always match the first entry, because it matches the condition and it's before the second entry (which also matches the condition). But if the entries were in a different order, where the id: 234 were before the id: 123 , it would find that one instead:

 const someValue = 123; const someOtherObj = {id: 234}; function match(array) { console.log(array.find(object => object.id === someValue || object.id === someOtherObj.id)); } match([ {id:123, name:"abc"}, // Finds this one {id:234, name:"xyz"}, {id:345, name:"pqr"} ]); match([ {id:345, name:"pqr"}, {id:234, name:"xyz"}, // Finds this one {id:123, name:"abc"} ]);