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javascript array methods cheat sheet

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Hurt Heron answered on March 2, 2021 Popularity 9/10 Helpfulness 1/10

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javascript array methods cheat sheet

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// example
[ "x", "y", "z" ].join(" - ") // "x - y - z"
// syntax
arr.join([separator])

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Source: dev.to

Tags: javascript methods

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Contributed on Jan 14 2022

Hurt Heron

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Javascript array cheatsheet

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// Javascript Array Methods

[3, 4, 5, 6].at(1); // 4
[3, 4, 5, 6].pop(); // [3, 4, 5]
[3, 4, 5, 6].push(7); // [3, 4, 5, 6, 7]
[3, 4, 5, 6].fill(1); // [1, 1, 1, 1]
[3, 4, 5, 6].join("-"); // 3-4-5-6
[3, 4, 5, 6].shift(); // [4, 5, 6]
[3, 4, 5, 6].reverse(); // [6, 5, 4, 3]
[3, 4, 5, 6].unshift(1); // [1, 3, 4, 5, 6]
[3, 4, 5, 6].includes(5); // true
[3, 4, 5, 6].map((num) => num + 6); // [9, 10, 11, 12]
[3, 4, 5, 6].find((num) => num > 4); // 5
[3, 4, 5, 6].filter((num) => num > 4); // [5, 6]
[3, 4, 5, 6].every((num) => num > 5); // false
[3, 4, 5, 6].findeIndex((num) => num > 4); // 2
[3, 4, 5, 6].reduce((acc, num) => acc + num, 0); // 18

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Contributed on Oct 01 2022

Ilham Fetchly

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list of javascript cheat sheet

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.every(n => ...) => Boolean // ie9+
.some(n => ..) => Boolean   // ie9+

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Source: devhints.io

Tags: javascript j

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Contributed on Mar 02 2021

DevLorenz02

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list of javascript cheat sheet

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.find(n => ...)  // es6
.findIndex(...)  // es6

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Source: devhints.io

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Contributed on Mar 02 2021

DevLorenz02

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list of javascript cheat sheet

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// before -- [_,_,NEW,REF,_,_]
list.splice(list.indexOf(REF), 0, NEW))

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Source: devhints.io

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Contributed on Mar 02 2021

DevLorenz02

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list of javascript cheat sheet

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re = list.splice(1)     // re = [b,c,d,e]  list == [a]
re = list.splice(1,2)   // re = [b,c]      list == [a,d,e]

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Contributed on Mar 02 2021

DevLorenz02

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list of javascript cheat sheet

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.map(n => ...)   // ie9+
.reduce((total, n) => total) // ie9+
.reduceRight(...)

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Source: devhints.io

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Contributed on Mar 02 2021

DevLorenz02

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list of javascript cheat sheet

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list = [a,b,c,d,e]

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Contributed on Mar 02 2021

DevLorenz02

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list of javascript cheat sheet

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list.push(X)            // list == [_,_,_,_,_,X]
list.unshift(X)         // list == [X,_,_,_,_,_]
list.splice(2, 0, X)    // list == [_,_,X,_,_,_]

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Contributed on Mar 02 2021

DevLorenz02

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list of javascript cheat sheet

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// after -- [_,_,REF,NEW,_,_]
list.splice(list.indexOf(REF)+1, 0, NEW))

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: devhints.io

Tags: javascript j

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Contributed on Mar 02 2021

DevLorenz02

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list of javascript cheat sheet

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.filter(n => ...) => array

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Source: devhints.io

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Contributed on Mar 02 2021

DevLorenz02

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javascript array methods cheat sheet

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javascript array methods cheat sheet

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Javascript array cheatsheet

list of javascript cheat sheet

list of javascript cheat sheet

list of javascript cheat sheet

list of javascript cheat sheet

list of javascript cheat sheet

list of javascript cheat sheet

list of javascript cheat sheet

list of javascript cheat sheet

list of javascript cheat sheet

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