How check if a string is substring with indexof [JAVASCRIPT]

Question

I have a method:

function isSubString(word,array){}

This method, given an array of words and a word, tries if the word is a substring of the others words in array.

for(var i=0;i<array.length;i++){

        if(JSON.stringify(array[i]).indexOf(JSON.stringify(word))>0){
            return 1;
        }
    }
    return 0;

For example array=['home','dog'] and word='ho';

Word ho is sub string of home but this method is wrong. Anyone can help me?

When comparing index use > -1 or !== -1.

Tushar
– Tushar

2016-01-07 14:54:26 +00:00
Commented Jan 7, 2016 at 14:54 — Tushar
– Tushar, Commented Jan 7, 2016 at 14:54
do you want the word to match all elements or at least one?

CoderPi
– CoderPi

2016-01-07 14:59:25 +00:00
Commented Jan 7, 2016 at 14:59 — CoderPi
– CoderPi, Commented Jan 7, 2016 at 14:59

Satpal · Accepted Answer · 2016-01-07 14:53:46Z

4

You don't need JSON.stringify(), use String.prototype.indexOf()

The indexOf() method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex. Returns -1 if the value is not found.

if(array[i].indexOf(word) >-1 ){

answered Jan 7, 2016 at 14:53

Satpal

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Comments

CoderPi · Accepted Answer · 2016-01-07 14:57:49Z

1

Using array.some()

function isSubstring(word, array) {
  return array.some(function(el){return el.indexOf(word) != -1})
}

var array = ['home','dog']
var word = 'ho'
var isSub = isSubstring(word, array)

// Demo output
document.write(isSub)

if you want all elements to match the substring use array.every() instead

answered Jan 7, 2016 at 14:57

CoderPi

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