nodejs remove duplicate entries code example
Example 1: javascript remove duplicate in arrays
function removeDuplicates(array) {
return array.filter((a, b) => array.indexOf(a) === b)
};
function removeDuplicates(array) {
let x = {};
array.forEach(function(i) {
if(!x[i]) {
x[i] = true
}
})
return Object.keys(x)
};
function removeDuplicates(array) {
array.splice(0, array.length, ...(new Set(array)))
};
function removeDuplicates(array) {
let a = []
array.map(x =>
if(!a.includes(x) {
a.push(x)
})
return a
};
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Example 2: javascript remove duplicate strings from array
let uniqueArray = [...new Set(arrayWithDuplicates)];
function removeArrayDuplicates(arrayWithDuplicates) {
let seen = {};
let uniqueArray = [];
let len = arrayWithDuplicates.length;
let j = 0;
for(let i = 0; i < len; i++) {
let item = arrayWithDuplicates[i];
if(seen[item] !== 1) {
seen[item] = 1;
uniqueArray[j++] = item;
}
}
return uniqueArray;
}