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Check for specific beginning or ending letters in a JavaScript function
We are required to write a JavaScript function that takes in two strings. Let’s call them str1 and str2.
Our function should check either str1 starts with str2 or it ends with str2. If this is the case, we should return true otherwise we should return false.
Example
Following is the code −
const str = 'this is an example string';
const startsOrEndsWith = (str1 = '', str2 = '') => {
if(str2.length > str1.length){
return false;
};
if(str1 === str2){
return true;
};
const { length: l1 } = str1;
const { length: l2 } = str2;
const startPart = str1.substring(0, l2);
const endPart = str1.substring(l1 - l2, l1);
return startPart === str2 || endPart === str2;
};
console.log(startsOrEndsWith(str, 'hel'));
console.log(startsOrEndsWith(str, 'ing'));
console.log(startsOrEndsWith(str, 'thi'));Output
Following is the output on console −
false true true
Updated on: 10-Dec-2020
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