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BFEdev

implement it by yourself

3. implement Array.prototype.flat()
16. create an Event Emitter
17. Create a simple store for DOM element
21. implement JSON.stringify()
22. implement JSON.parse()
29. implement async helper - `sequence()`
62. implement BigInt addition
75. implement BigInt subtraction
76. implement BigInt addition with sign
77. implement BigInt subtraction with sign
80. implement your own URLSearchParams
95. implement String.prototype.trim()
103. implement Math.sqrt()
109. implement `Math.pow()`
114. implement BigInt multiplication
115. implement BigInt division
116. implement Object.is()
122. implement memoizeOne()
123. implement Promise.prototype.finally()
125. implement classNames()
126. BigDecimal addition
127. BigDecimal subtraction
128. BigDecimal multiplication
129. BigDecimal Division
134. create your own Cookie
151. implement Array.prototype.map()