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Array every() method with example in JavaScript
JavaScript every() method: Here, we are going to learn about the every() method of array in JavaScript.
Submitted by IncludeHelp, on March 02, 2019
JavaScript every() method
every() method is used to check a condition on all array elements (or specified elements) and returns true if all elements match the condition and return false if any element does not match the condition.
Syntax
array.every(function, [value]);
Parameters
A function name and an optional value to be tested with all elements.
Ref: JS Array every() function
Return value
true or false
Sample Input/Output
Input:
var arr1 = [10, 20, 30, 40, 50];
var arr2 = [10, 0, -20, 40, 50];
//function to check elements are positive or not
function isPositive(n){
return n>=0;
}
Function call:
arr1.every(isPositive);
arr2.every(isPositive)
Output:
true
false
JavaScript Code to check whether all array elements are positive or not using Array.every() method
<html>
<head>
<title>JavaScipt Example</title>
</head>
<body>
<script>
//function to check positive numbers
function isPositive(n){
return n>=0;
}
var arr1 = [10, 20, 30, 40, 50];
var arr2 = [10, 0, -20, 40, 50];
if(arr1.every(isPositive)==true)
document.write("arr1 has all positive values<br>");
else
document.write("arr1 does not have all positive values<br>");
if(arr2.every(isPositive)==true)
document.write("arr2 has all positive values<br>");
else
document.write("arr2 does not have all positive values<br>");
</script>
</body>
</html>
Output
arr1 has all positive values
arr2 does not have all positive values
JavaScript Code to check whether all array elements are greater than 10 or not using Array.every() method
<html>
<head>
<title>JavaScipt Example</title>
</head>
<body>
<script>
//function to check positive numbers
function isPositive(n, value2test){
return n>=value2test;
}
var arr1 = [10, 20, 30, 40, 50];
var arr2 = [10, 0, -20, 40, 50];
if(arr1.every(isPositive, 10)==true)
document.write("arr1 has all values which are >=10<br>");
else
document.write("arr1 does not have all values which are >=10<br>");
if(arr2.every(isPositive, 10)==true)
document.write("arr2 has all values which are >=10<br>");
else
document.write("arr2 does not have all values which are >=10<br>");
</script>
</body>
</html>
Output
arr1 has all values which are >=10
arr2 does not have all values which are >=10
JavaScript Array Object Methods »
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