Looking for a JavaScript function that can determine whether a string is present in an array? Here's a simple solution:
function checkStringInArray(str, arr){
// code to check if the string is in the array
}
Keep in mind: this function does not rely on any JavaScript frameworks.
One way to achieve this functionality is by creating a custom array method:
Array.prototype.containsValue = function(value) {
var i;
for (i=0; i<this.length; i++) { if (this[i] === value) return true; }
return false;
}
if (['example'].containsValue('example')) alert('Success!');
It's worth noting the use of '===' for strict comparison which ensures more precise matching. If you require less specific matching, you can modify that part. For instance, using '==' instead. In that case, [3].containsValue('3') would return true.
One option is to utilize the arr.indexOf() method.
Do you think this method will work?
function checkValueExists(needle, haystack)
{
for(var index in haystack)
{
if(needle === haystack[index])
{
return true;
}
}
return false;
}
To easily check for the presence of an element in an array, you can utilize the Array.prototype.includes() method.
Here's an example to demonstrate how it works:
const array1 = [1, 2, 3];
console.log(array1.includes(2));
// Output: true
For additional insight, you can refer to this related post. Below is the snippet from the highest-rated response.
function contains(a, obj) {
var i = a.length;
while (i--) {
if (a[i] === obj) {
return true;
}
}
return false;
}
Caution:
When using the indexOf() function, be aware that it looks for partial matches. For example, if you have the values '12' and '1',
indexOf('1') will return the index of '12' instead of '1'
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