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Implement has() and hasMany() #18

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merged 1 commit into from
Jan 5, 2025
Merged

Implement has() and hasMany() #18

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19 changes: 19 additions & 0 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -284,6 +284,7 @@ class MemoryLevel extends AbstractLevel {
permanence: false,
createIfMissing: false,
errorIfExists: false,
has: true,
encodings: { [storeEncoding]: true },
signals: {
// Would have no value here because the operations are synchronous
Expand Down Expand Up @@ -313,6 +314,20 @@ class MemoryLevel extends AbstractLevel {
return keys.map(key => this[kTree].get(key))
}

async _has (key, options) {
const tree = options.snapshot != null
? options.snapshot[kTree]
: this[kTree]
return tree.get(key) !== undefined
}

async _hasMany (keys, options) {
const tree = options.snapshot != null
? options.snapshot[kTree]
: this[kTree]
return keys.map(has, tree)
}

async _del (key, options) {
this[kTree] = this[kTree].remove(key)
}
Expand Down Expand Up @@ -394,3 +409,7 @@ if (typeof process !== 'undefined' && !process.browser && typeof global !== 'und
function isRangeOption (k) {
return rangeOptions.has(k)
}

function has (key) {
return this.get(key) !== undefined
}
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