So you may want to rewrite your code as follows: function contains(a, obj) )) //falseĬonsole.log(. If you need the best performance, benchmark for yourself in the relevant execution environments.Īs others have said, the iteration through the array is probably the best way, but it has been proven that a decreasing while loop is the fastest way to iterate in JavaScript. If you need an easy solution, look for other answers. Try it Syntax startsWith(searchString) startsWith(searchString, position) Parameters searchString The characters to be searched for at the start of this string. It might not be relevant to modern JS execution contexts. The startsWith () method determines whether a string begins with the characters of a specified string, returning true or false as appropriate. Best JavaScript code snippets using contains(Showing top 15 results out of 819).
The return value was true, meaning Hello is present in the variable string. The promised performance improvement was based on a benchmark done in browsers of that time. Next, I will check if substring is present within string using the includes () method and print the result to the console: let string 'Hello, World' let substring 'Hello' console.log (string.includes (substring)) // output // true. Does anyone know of a way to check if a list contains a string without using indexOf In my array some strings can contains parts of others, so indexOf will produce false positives. Update from 2019: This answer is from 2008 (11 years old!) and is not relevant for modern JS usage. Javascript list contains a string duplicate Closed 6 years ago.
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