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ViewsHow do I fix the error '.has is not a function' when using JavaScript Map?
I have the following code that attempts to set a value in a Map:
class Trie {
constructor () {
this.trie = new Map()
}
insert(word) {
let current = this.trie
for (let alpha of word) {
if (!current.has(alpha)) current.set(alpha, [])
current = current.get(alpha)
}
current.word = word
}
}
let trie = new Trie()
trie.insert('test')
console.log(trie.trie)
When I attempt to run it, I get the error .has is not a function. What am I missing here?
·
Juan Pablo Isaza
1 answers
Answer question0
You're reassigning current to a non-Map value inside the loop, so on subsequent iterations, current.has will not work. Sounds like you need to change the [] to a new Map instead.
class Trie {
constructor () {
this.trie = new Map()
}
insert(word) {
let current = this.trie
for (let alpha of word) {
if (!current.has(alpha)) current.set(alpha, new Map())
current = current.get(alpha)
}
current.word = word
}
}
let trie = new Trie()
trie.insert('test')
console.log([...trie.trie])
·
Juan Pablo Isaza
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