const title=document.title;
const id = title.substring(0,title.indexOf(' '));
Can these two lines be more concise? What is the best practice to get substring from begin to first space
const title=document.title;
const id = title.substring(0,title.indexOf(' '));
Can these two lines be more concise? What is the best practice to get substring from begin to first space
Share asked Jan 7, 2018 at 8:16 bilabilabilabila 1,1631 gold badge13 silver badges20 bronze badges 5-
3
"Best practice" is, sometimes, quite subjective. But, regarding the code golf, this wins:
title.split(" ")[0]– Gerardo Furtado Commented Jan 7, 2018 at 8:19 -
By default
indexOfreturns the position of the first appearance of the searching string is available. – Tung Commented Jan 7, 2018 at 8:20 -
3
@GerardoFurtado technically
title.split` `[0]wins the code golf – Patrick Roberts Commented Jan 7, 2018 at 8:42 - @PatrickRoberts Yes, it does! – Gerardo Furtado Commented Jan 7, 2018 at 8:47
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I would argue split is probably what most people would want in this case. If there is no space it will still work,
str = 'Prince'; str.substring(0, str.indexOf(' '))will not. – user128511 Commented Jan 7, 2018 at 10:30
2 Answers
Reset to default 6Reference split method
You can using split() method
const id = title.split(' ')[0]
You can use the split() function. The split function breaks the whole string in the form of array. In the code give below, the variable title contains string 'Muhammad Usman', so the function split() breaks the string in the form or an array in 'id' variable. Therefore the 0-th index of id, id[0] contains the value 'Muhammad' & index 1 of id id[1] contains the value 'Usman'.
I'm attaching the output of the code which prints the first string before the space.
<html>
<body>
<script language="javascript" type="text/javascript">
const title="Muhammad Usman";
const id=title.split(' ')[0];
document.write("id :" + id);
</script>
</body>
</html>