Check if string contains word at start of string

Question

I am starting to learn a little bit more advanced js and i want to check if string contains a word at the start of the line. Something like this would be good!:

var string = "Hello world";
if (string.contains("Hello", start) == true)
{
console.log("success");
}

Im sorry about not mentioning that i want it to work in node js — Elias Sjögreen, Jul 31 '16 at 15:59

score 6 · Answer 1 · answered Jul 31 '16 at 15:56

6

Very easy Method:

var str = "Hello World";

if (str.startsWith("Hello")){
    do stuff;
}

You could also make two arrays and compare the single letters using a for loop, slightly more creative :D

answered Jul 31 '16 at 15:56

marcb20012

73
5

Thx it worked great – Elias Sjögreen Jul 31 '16 at 16:16
But not in node js now when i tested it sorry – Elias Sjögreen Aug 01 '16 at 08:07
You could do it "manually",but I'll post it in another answer so I have the code format. – marcb20012 Aug 01 '16 at 19:59
var str = "Hello World"; var test = "Hello"; var size = test.length; if ( test == str.substring(0,size)){ do stuff;} – marcb20012 Aug 01 '16 at 20:06

score 1 · Answer 2 · answered Jul 31 '16 at 15:51

1

if (fullString.substring(0, stringToFind.length) == stringToFind) {

}

answered Jul 31 '16 at 15:51

Danny Buonocore

3,731
3
24
46

This worked to but it was a little long – Elias Sjögreen Jul 31 '16 at 16:17
Seems to not work in node.js tho – Elias Sjögreen Aug 01 '16 at 08:06

score 1 · Answer 3 · answered Jul 31 '16 at 15:56

In ES6, you can use startsWith: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith.

Otherwise you can use RegExp with '^' which matches the beginning of input (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions) like this: /^Hello/.test('Hello World')

Check if string contains word at start of string

3 Answers3