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JavaScript-reeks elke ()

Voorbeeld 1

Kyk of alle waardes in ouderdomme[] ouer as 18 is:

const ages = [32, 33, 16, 40];

ages.every(checkAge)

function checkAge(age) {
  return age > 18;
}

Meer "Probeer dit self" voorbeelde hieronder.


Definisie en gebruik

Die every()metode voer 'n funksie vir elke skikkingselement uit.

Die every()metode gee terug trueas die funksie waar vir alle elemente gee.

Die every()metode gee terug falseas die funksie vals vir een element gee.

Die every()metode voer nie die funksie vir leë elemente uit nie.

Die every()metode verander nie die oorspronklike skikking nie


Sintaksis

array.every(function(currentValue, index, arr), thisValue)

Grense

Parameter Description
function() Required.
A function to be run for each element in the array.
currentValue Required.
The value of the current element.
index Optional.
The index of the current element.
arr Optional.
The array of the current element.
thisValue Optional. Default undefined.
A value passed to the function as its this value.

Terugkeerwaarde

Tik Beskrywing
'n Boole trueas alle elemente die toets slaag, anders false.


Blaaierondersteuning

every() is 'n ECMAScript5 (ES5) kenmerk.

ES5 (JavaScript 2009) word ten volle ondersteun in alle blaaiers:

Chrome IE Edge Firefox Safari Opera
Yes 9-11 Yes Yes Yes Yes

Meer voorbeelde

Kyk of alle antwoorde dieselfde is:

const survey = [
  { name: "Steve", answer: "Yes"},
  { name: "Jessica", answer: "Yes"},
  { name: "Peter", answer: "Yes"},
  { name: "Elaine", answer: "No"}
];

let result = survey.every(isSameAnswer);

function isSameAnswer(el, index, arr) {
  if (index === 0) {
    return true;
  } else {
    return (el.answer === arr[index - 1].answer);
  }
}

Kyk of alle waardes oor 'n spesifieke getal is:

<p><input type="number" id="ageToCheck" value="18"></p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
const ages = [32, 33, 12, 40];

function checkAge(age) {
  return age > document.getElementById("ageToCheck").value;
}

function myFunction() {
  document.getElementById("demo").innerHTML = ages.every(checkAge);
}
</script>