在另一个数组javascript中找到数组元素的索引

Question

I've 2 1-D arrays like this:

var words = ['Habitat for Humanity', 'Caring', 'Helping', 'People', 'Safety', 'Security', 'Shelter', 'Community', 'Volunteering'];
var sources = ['Helping', 'Community', 'Caring', 'Safety', 'Security'];

I want to find out the index of an element taken from the 'sources' array in the 'words' array. For example, the element 'Helping' in the 'sources' array is located at index 2 in 'words' array. So I need "2" as my solution when I search for index of the word "Helping". Can somebody help me on this? Thanks.

I tried using 'indexOf' function in arrays but id didn't work and when I searched for similar questions, it's been said that it'll not work in this problem.

Answer 1

Yes, indexOf will do the job. Check:

var words = ['Habitat for Humanity', 'Caring', 'Helping', 'People', 'Safety', 'Security', 'Shelter', 'Community', 'Volunteering'];
var sources = ['Helping', 'Community', 'Caring', 'Safety', 'Security'];

sources.forEach(function(source){
console.log(source, 'is at position', words.indexOf(source));
});

 var words = ['Habitat for Humanity', 'Caring', 'Helping', 'People', 'Safety', 'Security', 'Shelter', 'Community', 'Volunteering']; var sources = ['Helping', 'Community', 'Caring', 'Safety', 'Security']; sources.forEach(function(source){ document.getElementsByTagName('div')[0].innerHTML += source + ' is at position: ' + words.indexOf(source) + '<br>'; }); 

 <div></div> 

Answer 2

sources.map(function(word) { return words.indexOf(word); })
// => [2, 7, 1, 4, 5]

Answer 3

You can use an each function.

$.each(words, function(key, value) {
      if(value == 'Helping'){
          alert(key);
      }
});

Answer 4

var searchArray=function(value,words){
var result=-1;
for(var i=0;i<words.length;i++){
if(words[i]==value){
result=i;break
}
return result;
}

Answered From mobile. Feel free to format.