In JavaScript, you can check if every element of the first array exists in the second array, in the following ways: Using Array.prototype.every();
put-array-or-string-here.indexOf() Code //code to check if a value exists in an array using javascript indexOf var fruits_arr = ['Apple', 'Mango', 'Grapes', 'Orange', 'Fig', 'Cherry']; var string = "Orange"; // Find in Array fruits_arr.indexOf('Tomato'); fruits_arr.in...
Example: const fruits = ["Banana", "Orange", "Apple", "Mango"]; fruits.includes("Mango"); check if an item exists in an array: const nums = [ 1, 3, 5, 7]; console.log(nums.includes(3)); // true
varfruits=["Apple","Banana","Mango","Orange","Papaya"];// Check if a value exists in the fruits arrayif(fruits.indexOf("Mango")!==-1){alert("Value exists!")}else{alert("Value does not exists!")} ES6 has introduced theincludes()method to perform this task very easily. But, ...
要检查数组中是否存在值,可以使用 JavaScript 中的Array.prototype.includes()方法或者 jQuery 中的$.inArray()方法。 使用JavaScript 的Array.prototype.includes()方法: 代码语言:javascript 复制 constarray=[1,2,3,4,5];constvalueToCheck=3;if(array.includes(valueToCheck)){console.log("Value exists ...
const checkKey = (obj, keyName) => { let keyExist = Object.keys(obj).some(key => key === keyName); console.log(keyExist); }; checkKey(user, 'name'); // Return true Using some() for an Array let number = [12, 33, 14, 45]; // Check if key exists number.some(value...
For the search feature, we check if the return type of the.indexOf(searchText)is greater than-1. If so, then the search result should betrueelsefalse. Let us look at the same example discussed above to check if an element exists in the array. ...
JavaScript check if a value exists in an array of objects Simple example code. <!DOCTYPE html> const arr = [{ id: 1, username: 'fred' }, { id: 2, username: 'bill' }, { id: 3, username: 'ted' }]; const found = arr.some...
constarray=[3,8,12,6,10,2];// Find 10 in the given array.functioncheckForN(arr,n){for(leti=0;i<array.length;i++){if(n===array[i]){return`${true}${n}exists at index${i}`;}}return`${false}${n}does not exist in the given array.`;}checkForN(array,10); ...
vara = ["Abhishek","Biraj","Mahi","Tamana","Sahir"];// This will check if the given value exists in the "a" arrayif(a.indexOf("Sahir") !== -1){alert("The value is present in the array.!") }else{alert("The value is not present in the array.!") ...