结合 some() 和 startsWith() javascript

Question

I have an array with strings: const fruits = ['Apple', 'Banana', 'Orange']

I am trying to write a function that returns true or false depending on if a string starts with any string in the array, which would be true for example 'Applepie' or 'Bananabread' .

I found startsWith() and some() , and combining them is sort of what I am after.

How would I do this?

Answer 1

You'd call some on the array and return the result of theString.startsWith(theArrayEntryForEachLoopIteration) , like this:

const theString = "Applepie";
const result = fruits.some(fruit => theString.startsWith(fruit));

result will be true if there was a match (your callback returned a truthy value), false if there wasn't (your callback never returned a truthy value). some will also stop looking the first time your callback returns a truthy value, since there's no point in looking further.

Live Example:

 const fruits = ['Apple', 'Banana', 'Orange']; // Example where it's there: const theString = "Applepie"; const result = fruits.some(fruit => theString.startsWith(fruit)); console.log(result); // Example where it isn't const theString2 = "Toffeepie"; const result2 = fruits.some(fruit => theString2.startsWith(fruit)); console.log(result2);

MDN has good reference and tutorial content: some , startsWith .

Answer 2

 const text = 'Applepie'; //Input Text const fruits = ['Apple', 'Banana', 'Orange']; console.log(fruits.some(v => text.startsWith(v)));