rue;
        return num > arr[idx - 1];
      });
    console.log(isIncreasing); // true
    

###  Using every() on sparse arrays

` every() ` will not run its predicate on empty slots.

js

    
    
    console.log([1, , 3].every((x) => x !== undefined)); // true
    console.log([2, , 2].every((x) => x === 2)); // true
    

###  Calling every() on non-array objects

The ` every() ` method reads the ` length ` property of ` this ` and then
accesses each property with a nonnegative integer key less than ` length `
until they all have been accessed or ` callbackFn ` returns ` false ` .

js

    
    
    const arrayLike = {
      length: 3,
      0: "a",
      1: "b",
      2: "c",
      3: 345, // ignored by every() since length is 3
    };
    console.log(
      Array.prototype.every.call(arrayLike, (x) => typeof x === "string"),
    ); // true
    

##  Specifications

Specification  
---  
[ ECMAScript Language Specification  
#  sec-array.prototype.every  ](https://tc39.es/ecma262/multipage/indexed-
collections.html#sec-array.prototype.every)  
  
##  Browser compatibility

BCD tables only load in the browser  with JavaScript enabled. Enable
JavaScript to view data.

##  See also

  * [ Polyfill of ` Array.prototype.every ` in ` core-js ` ](https://github.com/zloirock/core-js#ecmascript-array)
  * [ Indexed collections ](/en-US/docs/Web/JavaScript/Guide/Indexed_collections) guide 
  * [ ` Array ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)
  * [ ` Array.prototype.forEach() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach)
  * [ ` Array.prototype.some() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some)
  * [ ` Array.prototype.find() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find)
  * [ ` TypedArray.prototype.every() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/every)

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